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Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Numerator (for basic and diluted earnings per share)        
Net income (loss) $ (26,684) $ 12,522 $ (20,078) $ 28,898
Less income allocated to RSUs 0 174 0 373
Numerator for basic and diluted earnings per share $ (26,684) $ 12,348 $ (20,078) $ 28,525
Denominator        
Basic weighted-average shares outstanding 82,039 83,230 82,140 83,654
Effect of dilutive securities:        
Stock options held by directors 0 288 0 306
Diluted weighted-average shares outstanding 82,039 83,518 82,140 83,960
Anti-dilutive securities 1,373 0 1,373 0