Earnings Per Share - Antidilutive Securities (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share
Total anti-dilutive securities	5,180	1,760	1,180	5,770
Share-based awards
Antidilutive Securities Excluded from Computation of Earnings Per Share
Total anti-dilutive securities	190	60	140	260
Convertible note hedge
Antidilutive Securities Excluded from Computation of Earnings Per Share
Total anti-dilutive securities	590	930	1,040	340
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share
Total anti-dilutive securities	4,400	770	0	5,170