Stock-Based Compensation - Share-based Award Expense Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, expense	$ 9,019	$ 5,488	$ 18,945	$ 9,928
Stock option grants expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, expense	725	717	1,589	1,212
Restricted stock awards expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, expense	1,452	1,053	3,921	2,570
Performance share units expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, expense	$ 6,842	$ 3,718	$ 13,435	$ 6,146