Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical)

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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Statement Of Financial Position [Abstract]    
Allowance for doubtful accounts $ 1,988 $ 2,273
Property, accumulated depreciation and amortization $ 272,728 $ 255,862
Common shares, par value $ 0.001 $ 0.001
Common shares, shares authorized 1,000,000,000 1,000,000,000
Common shares, shares outstanding 103,000,000 106,900,000