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Long-Term Debt (Details Textuals) (USD $)
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1 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | 6 Months Ended | 3 Months Ended | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Aug. 31, 2009
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Jun. 30, 2011
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Jun. 30, 2010
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Jun. 30, 2011
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Jun. 30, 2010
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Dec. 31, 2010
Secured Debt [Member]
Prior Credit Facility [Member]
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Jun. 30, 2011
Secured Debt [Member]
New Credit Facility [Member]
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Dec. 31, 2010
Revolving credit facility [Member]
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Dec. 31, 2010
Term Loan Portion [Member]
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Mar. 31, 2011
New Credit Facility [Member]
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Jun. 30, 2011
New Credit Facility [Member]
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Mar. 31, 2011
New Credit Facility [Member]
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Jun. 30, 2011
New Credit Facility [Member]
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Mar. 09, 2011
New Credit Facility [Member]
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Dec. 31, 2010
New Credit Facility [Member]
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Jun. 30, 2011
New Credit Facility [Member]
Maximum [Member]
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Jun. 30, 2011
New Credit Facility [Member]
Minimum [Member]
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Mar. 31, 2011
Prior Credit Facility [Member]
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Jun. 30, 2011
Prior Credit Facility [Member]
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Dec. 31, 2010
Prior Credit Facility [Member]
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| Long-Term Debt (Textuals) | ||||||||||||||||||||
| Senior secured revolving credit facility | $ 700,000,000 | |||||||||||||||||||
| New Credit Facility, maturity date | Mar. 9, 2016 | |||||||||||||||||||
| Margin portion of interest rate in addition to LIBOR rate | 1.75% | |||||||||||||||||||
| Margin portion of interest rate in addition to base rate | 0.75% | |||||||||||||||||||
| Margin Portion of Interest Rate in Addition to LIBOR Rate after March 2011 | 2.50% | 1.50% | ||||||||||||||||||
| Margin Portion Of Interest Rate In Addition Base Rate | 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 | 390,700,000 | 229,000,000 | 101,000,000 | 235,700,000 | 54,000,000 | |||||||||||||||
| Repayments of Long-term Lines of Credit | 123,000,000 | 55,700,000 | 228,900,000 | |||||||||||||||||
| Amounts outstanding | 31,000,000 | 143,900,000 | 158,000,000 | 158,000,000 | 0 | 0 | 174,900,000 | |||||||||||||
| Long-term Debt, Weighted Average Interest Rate | 1.75% | 1.97% | ||||||||||||||||||
| Foreign currency borrowings outstanding | 0 | 0 | ||||||||||||||||||
| Additional Long Term Debt (Textuals) [Abstract] | ||||||||||||||||||||
| Interest expense | 3,100,000 | 2,500,000 | 6,400,000 | 5,000,000 | ||||||||||||||||
| Write-off of unamortized deferred financing costs resulting from the extinguishment of the prior senior secured facility | 914,000 | |||||||||||||||||||
| Debt issuance costs | $ 5,700,000 | $ 5,700,000 | ||||||||||||||||||
| Line of Credit Facility, Interest Rate Description | LIBOR + 1.50%+ 2.50% | The highest of Federal Funds Rate plus 0.50%, one-month LIBOR plus 1.00%, and the prime rate offered by Bank of America | ||||||||||||||||||