Income (Loss) Per Share - Shares Excluded from EPS (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Common share equivalents
Diluted income (loss) per share
Securities excluded from the diluted calculation as their effect would be antidilutive	712	498	671	344
Potentially dilutive shares
Diluted income (loss) per share
Securities excluded from the diluted calculation as their effect would be antidilutive	1,194	1,903	1,132	1,933
Convertible Notes
Diluted income (loss) per share
Securities excluded from the diluted calculation as their effect would be antidilutive	15,354	8,618	15,354	8,618