Stock-based Compensation - Other (Details) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) item shares	Jun. 30, 2019 USD ($) shares	Jun. 30, 2020 USD ($) item shares	Jun. 30, 2019 USD ($) shares
Stock-Based Compensation
Number of stock based compensation plans | item	1		1
Grant date fair value | $	$ 150		$ 28,381	$ 25,763
Stock-based compensation expense | $	$ 6,757	$ 5,652	$ 19,125	$ 10,183
Stock Options
Stock-Based Compensation
Granted (in units)			273	344
Grant date fair value | $			$ 2,770	$ 2,965
Exercised (in units)	144	29	324	118
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)	5		310	330
Grant date fair value | $	$ 150		$ 10,823	$ 7,545
Vested (in units)			348	291