Stock-based Compensation - Other (Details) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) item shares	Sep. 30, 2019 USD ($) shares	Sep. 30, 2020 USD ($) item shares	Sep. 30, 2019 USD ($) shares
Stock-Based Compensation
Number of stock based compensation plans | item	1		1
Grant date fair value | $		$ 102	$ 28,381	$ 25,865
Stock-based compensation expense | $	$ 7,095	$ 8,941	$ 26,220	$ 19,124
Stock Options
Stock-Based Compensation
Granted (in units)			273	344
Grant date fair value | $			$ 2,770	$ 2,965
Exercised (in units)	152	127	476	245
Performance-based RSUs
Stock-Based Compensation
Granted (in units)			422	665
Grant date fair value | $			$ 14,788	$ 15,253
Vested (in units)			603	648
Time-based RSUs
Stock-Based Compensation
Granted (in units)		4	310	334
Grant date fair value | $		$ 102	$ 10,823	$ 7,647
Vested (in units)	7	3	355	294