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Summarized Quarterly Financial Data (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule of quarterly financial information                      
Revenues $ 124,083 $ 110,031 $ 131,980 $ 137,506 $ 141,933 $ 124,260 $ 146,254 $ 149,532 $ 503,600 $ 561,979 $ 627,434
Income (loss) from operations (30,096) 6,621 26,257 29,919 28,725 7,836 36,168 40,858 32,701 113,587 179,143
Net income (loss) $ (18,957) $ 3,149 $ 15,002 $ 17,231 $ 16,627 $ 4,103 $ 21,212 $ 23,989 $ 16,425 $ 65,930 $ 106,044
Net income per share:                      
Basic $ (1.80) $ 0.30 $ 1.43 $ 1.59 $ 1.47 $ 0.36 $ 1.86 $ 2.10 $ 1.55 $ 5.79 $ 8.91
Diluted $ (1.80) $ 0.30 $ 1.42 $ 1.59 $ 1.47 $ 0.36 $ 1.85 $ 2.09 $ 1.55 $ 5.76 $ 8.88