Stock-based Compensation - Other (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Stock-Based Compensation
Grant date fair value	$ 28,200	$ 25,763
Stock-based compensation expense	$ 12,368	$ 4,531
Stock Options
Stock-Based Compensation
Granted (in units)	273	344
Grant date fair value	$ 2,770	$ 2,965
Exercised (in units)	180	89
Performance-based RSUs
Stock-Based Compensation
Granted (in units)	422	665
Grant date fair value	$ 14,768	$ 15,253
Vested (in units)	603	648
Time-based RSUs
Stock-Based Compensation
Granted (in units)	304	330
Grant date fair value	$ 10,662	$ 7,545
Vested (in units)	348	291