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Summary of Unaudited Quarterly Financial Information Restated of Previously Reported Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Error Corrections and Prior Period Adjustments Restatement [Line Items]                        
Income tax benefit $ 514 $ 219,362 $ (265) $ (15) $ (280) $ (124) $ 47 $ (53) $ 219,083 $ 219,596 $ (410) $ (374)
Net income $ 6,341 $ 226,646 $ 23,564 $ 754 $ 7,055 $ 1,280 $ 1,592 $ 2,097 $ 250,964 $ 257,305 $ 12,024 $ 11,420
Basic net income per share (in usd per share) $ 0.32 $ 11.40 $ 1.19 $ 0.04 $ 0.35 $ 0.06 $ 0.08 $ 0.10 $ 12.71 $ 13.00 $ 0.59 $ 0.56
Diluted net income per share (in usd per share) $ 0.29 $ 10.56 $ 1.11 $ 0.04 $ 0.34 $ 0.06 $ 0.07 $ 0.10 $ 11.88 $ 12.12 $ 0.56 $ 0.55
Long-term deferred tax assets $ 216,564 $ 208,530             $ 208,530 $ 216,564    
Accumulated deficit $ (402,010) (408,351)     $ (659,315)       (408,351) $ (402,010) $ (659,315)  
Previously Reported                        
Error Corrections and Prior Period Adjustments Restatement [Line Items]                        
Income tax benefit   217,255             216,976      
Net income   $ 224,539             $ 248,857      
Basic net income per share (in usd per share)   $ 11.29             $ 12.61      
Diluted net income per share (in usd per share)   $ 10.46             $ 11.78      
Long-term deferred tax assets   $ 206,423             $ 206,423      
Accumulated deficit   $ (410,458)             $ (410,458)