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Earnings (Loss) Per Share - Securities Excluded from the Computation of Diluted Earnings (Loss) Per Common Share (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Stock options      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Securities excluded from computation of earnings per common share (in shares) 390 648 83
Restricted stock awards      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Securities excluded from computation of earnings per common share (in shares) 118 221 10
Performance-based warrants      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Securities excluded from computation of earnings per common share (in shares) 175,000 68,750 0