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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Numerator:                      
Net income $ (3,445) $ 4,511 $ 3,876 $ 1,878 $ 12,992 $ 182,033 $ 6,861 $ 9,502 $ 6,820 $ 211,388 $ 26,201
Denominator:                      
Weighted-average common shares outstanding, Basic (in shares) 110,788 110,214 109,904 109,733 111,476 116,444 116,027 115,336 110,162 114,814 114,318
Effect of potential dilutive common shares                 2,978 2,670 3,306
Denominator:                      
Weighted-average commone chares outstanding, Diluted (in shares) 110,788 113,723 112,061 112,252 113,388 119,542 120,939 117,442 113,140 117,484 117,624
Earnings Per Share, Basic                 $ 0.06 $ 1.84 $ 0.23
Earnings Per Share, Diluted                 $ 0.06 $ 1.80 $ 0.22