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Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Restricted cash and investments, current $ 15,780 $ 15,654
Allowance for doubtful accounts 2,403 2,546
Restricted cash and investments, non-current 30,337 32,756
Property and equipment, net 1,680,165 1,687,159
Current portion of capital lease obligations, long-term debt and non-recourse debt 59,627 53,882
Non-recourse debt 97,964 104,836
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 30,000,000 30,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 90,000,000 90,000,000
Common stock, shares issued 86,188,835 86,007,433
Common stock, shares outstanding 71,600,440 71,417,034
Treasury stock, shares 14,588,395 14,590,399
Variable Interest Entity, Primary Beneficiary
   
Restricted cash and investments, current 6,308 6,182
Restricted cash and investments, non-current 8,916 15,521
Property and equipment, net 25,692 25,840
Current portion of capital lease obligations, long-term debt and non-recourse debt 5,450 5,200
Non-recourse debt $ 11,569 $ 16,997