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Earnings Per Share - Computations Of Basic And Diluted EPS (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
Basic:        
Net income (loss) $ 2,290 $ 11,462 $ (20,528) $ (27,032)
Less: Undistributed earnings allocated to participating securities (27) (160)    
Undistributed earnings allocated to common shares $ 2,263 $ 11,302    
Weighted average number of shares outstanding, basic (in shares) 145,958 113,680 145,057 109,135
Effect of dilutive securities:        
Share-based awards other than participating securities $ 0 $ 0    
Undistributed earnings reallocated to participating securities 0 0    
Net income, diluted $ 2,263 $ 11,302    
Share-based awards other than participating securities (in shares) 0 0    
Weighted average number of shares outstanding, diluted (in shares) 145,958 113,680 145,057 109,135