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Earnings (Loss) Per Share - Reconciliation of basic and diluted EPS (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share [Abstract]      
Net (loss) income $ (33,226) $ (95,304) $ 68,271
Weighted average shares:      
Basic shares (in shares) 37,403 37,325 40,465
Effect of dilutive securities - options and warrants outstanding (in shares) 0 0 1,300
Diluted shares (in shares) 37,403 37,325 41,765
Net income (loss) per share - basic (in usd per share) $ (0.89) $ (2.55) $ 1.69
Net income (loss) per share - diluted (in usd per share) $ (0.89) $ (2.55) $ 1.63