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Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Numerator:        
Basic net income (loss) $ 647 $ 117,361 $ 3,086 $ 118,152
Effect of diluted securities   1,200   2,400
Diluted net income (loss) $ 647 $ 118,561 $ 3,086 $ 120,552
Denominator:        
Basic weighted average shares outstanding (in shares) 22,487 22,403 22,479 22,396
Effect of diluted securities (in shares) 313 4,245 306 4,219
Diluted weighted average shares outstanding (in shares) 22,800 26,648 22,785 26,615
Basic earnings per share (in dollars per share) $ 0.03 $ 5.24 $ 0.14 $ 5.28
Diluted earnings per share (in dollars per share) $ 0.03 $ 4.45 $ 0.14 $ 4.53