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Earnings Per Share - Computations of Basic and Diluted EPS (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Basic:    
Net income (loss) $ (27,823) $ 19,642
Less undistributed earnings allocated to participating securities 0 (114)
Undistributed earnings allocated to common shares $ (27,823) $ 19,528
Weighted average number of shares outstanding, basic 105,908 105,290
Diluted:    
Undistributed earnings allocated to common shares $ (27,823) $ 19,528
Share-based awards other than participating securities $ 0 $ 0
Share-based awards other than participating securities (in shares) 0 0
Undistributed earnings reallocated to participating securities $ 0 $ 0
Net income (loss) $ (27,823) $ 19,528
Weighted average number of shares outstanding, diluted 105,908 105,290