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Long-Term Debt (Details Textual) (USD $)
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12 Months Ended | 1 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 3 Months Ended | |||||||||||||
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Mar. 31, 2011
New Credit Facility [Member]
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Dec. 31, 2011
New Credit Facility [Member]
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Mar. 09, 2011
New Credit Facility [Member]
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Dec. 31, 2011
New Credit Facility [Member]
Maximum [Member]
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Dec. 31, 2011
New Credit Facility [Member]
Maximum [Member]
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Dec. 31, 2011
New Credit Facility [Member]
Minimum [Member]
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Dec. 31, 2011
New Credit Facility [Member]
Minimum [Member]
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Dec. 31, 2011
Prior Credit Facility [Member]
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Dec. 31, 2010
Prior Credit Facility [Member]
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Jul. 21, 2006
Prior Credit Facility [Member]
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Dec. 31, 2011
Secured Debt [Member]
New Credit Facility [Member]
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Dec. 31, 2010
Secured Debt [Member]
Prior Credit Facility [Member]
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Sep. 30, 2007
Revolving credit facility [Member]
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Mar. 31, 2011
Revolving credit facility [Member]
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Dec. 31, 2010
Revolving credit facility [Member]
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Sep. 12, 2007
Revolving credit facility [Member]
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Jul. 21, 2006
Revolving credit facility [Member]
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Mar. 31, 2011
Term Loan Portion [Member]
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Dec. 31, 2010
Term Loan Portion [Member]
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Jul. 21, 2006
Term Loan Portion [Member]
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| Long-Term Debt (Textual) [Abstract] | |||||||||||||||||||||||
| New Credit Facility, maturity date | March 9, 2016 | ||||||||||||||||||||||
| Margin portion of interest rate in addition to LIBOR rate | 1.75% | 1.25% | 1.50% | ||||||||||||||||||||
| Margin portion of interest rate in addition to base rate | 0.75% | 0.25% | 0.50% | ||||||||||||||||||||
| Margin Portion of Interest Rate in Addition to LIBOR Rate after March 2011 | 2.50% | 1.50% | |||||||||||||||||||||
| Margin portion of interest rate in addition to base rate after March 2011 | 1.50% | 0.50% | |||||||||||||||||||||
| Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.50% | 0.25% | |||||||||||||||||||||
| Repayment of all amounts outstanding under the Prior Credit Facility by using borrowings under the New Credit Facility | $ 196,000,000 | ||||||||||||||||||||||
| Borrowings under Long-term Lines of Credit | 427,000,000 | 212,000,000 | 859,700,000 | 54,000,000 | |||||||||||||||||||
| Repayments of Long-term Lines of Credit | 487,000,000 | 298,700,000 | 657,700,000 | 228,900,000 | |||||||||||||||||||
| Amount outstanding | 202,000,000 | 0 | 174,900,000 | 31,000,000 | 143,900,000 | ||||||||||||||||||
| Long-term Debt, Weighted Average Interest Rate | 1.89% | 1.75% | |||||||||||||||||||||
| Foreign currency borrowings outstanding | 0 | ||||||||||||||||||||||
| Credit facility maturity | 5 years | ||||||||||||||||||||||
| Increase in maximum aggregate borrowing capacity | 150,000,000 | ||||||||||||||||||||||
| Senior secured revolving credit facility | 700,000,000 | 300,000,000 | 250,000,000 | 100,000,000 | 200,000,000 | ||||||||||||||||||
| Annual scheduled principal payments, 2012 | 0 | ||||||||||||||||||||||
| Annual scheduled principal payments, 2013 | 0 | ||||||||||||||||||||||
| Annual scheduled principal payments, 2014 | 0 | ||||||||||||||||||||||
| Annual scheduled principal payments, 2015 | 0 | ||||||||||||||||||||||
| Annual scheduled principal payments, 2016 | 0 | ||||||||||||||||||||||
| Additional interest rate to federal funds rate | 0.50% | ||||||||||||||||||||||
| Additional interest rate to LIBOR | 1.00% | ||||||||||||||||||||||
| Additional Long Term Debt (Textual) [Abstract] | |||||||||||||||||||||||
| Debt issuance costs | 5,700,000 | ||||||||||||||||||||||
| Interest expense | 9,900,000 | 9,700,000 | 9,600,000 | ||||||||||||||||||||
| Write-off of unamortized deferred financing costs resulting from the extinguishment of the prior senior secured facility | $ 914,000 | ||||||||||||||||||||||