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Income (Loss) Per Common Share - Shares Excluded from EPS (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Common share equivalents        
Diluted income (loss) per share        
Securities excluded from the diluted calculation as their effect would be antidilutive 498 22 344 23
Potentially dilutive shares        
Diluted income (loss) per share        
Securities excluded from the diluted calculation as their effect would be antidilutive 1,903 2,706 1,933 2,204
Convertible Notes        
Diluted income (loss) per share        
Securities excluded from the diluted calculation as their effect would be antidilutive 8,618 8,618 8,618 8,618