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Earnings (Loss) Per Share - Basic and Diluted Earnings per Share (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Class of Stock [Line Items]        
Weighted average common shares outstanding - Basic (in shares) 57,869 57,854 57,566 57,764
Assumed conversions:        
Weighted average common shares outstanding - Diluted (in shares) 57,869 57,854 57,566 57,764
Stock Options        
Assumed conversions:        
Incremental common shares from stock options and restricted stock units (in shares) 0 0 0 0
Restricted Stock Units        
Assumed conversions:        
Incremental common shares from stock options and restricted stock units (in shares) 0 0 0 0