Stock-based Compensation - Other (Details) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) item shares	Jun. 30, 2020 USD ($) shares	Jun. 30, 2021 USD ($) item shares	Jun. 30, 2020 USD ($) shares
Stock-Based Compensation
Number of stock based compensation plans | item	1		1
Grant date fair value | $		$ 150	$ 33,419	$ 28,381
Stock-based compensation expense | $	$ 8,894	$ 6,757	$ 19,771	$ 19,125
Stock Options
Stock-Based Compensation
Granted (in units)			249	273
Grant date fair value | $			$ 5,116	$ 2,770
Exercised (in units)	97	144	185	324
Performance-based RSUs
Stock-Based Compensation
Granted (in units)			310	422
Grant date fair value | $			$ 18,237	$ 14,788
Vested (in units)			640	603
Time-based RSUs
Stock-Based Compensation
Granted (in units)		5	171	310
Grant date fair value | $		$ 150	$ 10,066	$ 10,823
Vested (in units)	2		307	348