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Earnings (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 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
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Numerator:                      
Net income (loss) $ 12,992 $ 182,033 $ 6,861 $ 9,502 $ 7,841 $ 5,513 $ 5,043 $ 7,804 $ 211,388 $ 26,201 $ (33,748)
Denominator:                      
Weighted-average common shares outstanding, Basic (in shares) 111,476 116,444 116,027 115,336 115,024 114,523 114,116 113,590 114,814 114,318 112,415
Effect of potential dilutive common shares                 2,670 3,306 0
Denominator:                      
Weighted-average commone chares outstanding, Diluted (in shares) 113,388 119,542 120,939 117,442 117,620 118,206 117,398 116,629 117,484 117,624 112,415
Earnings Per Share, Basic                 $ 1.84 $ 0.23 $ (0.30)
Earnings Per Share, Diluted                 $ 1.80 $ 0.22 $ (0.30)