Leases - Components of Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating Lease, Cost	$ 22,081	$ 23,221
Variable Lease, Cost	2,582	2,103
Lease, Cost, Total	24,663	25,324
Operating Lease, Payments	20,678	19,899
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	13,051	23,511
Operating Lease, Right-of-Use Asset	76,276	79,773
Operating Lease, Liability, Current	16,243	17,049
Operating Lease, Liability, Noncurrent	66,823	68,919
Total operating lease liability	$ 83,066	$ 85,968
Operating Lease, Weighted Average Remaining Lease Term	5 years 7 months 6 days	5 years 10 months 24 days
Operating Lease, Weighted Average Discount Rate, Percent	4.50%	4.90%
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesCurrent	us-gaap:OtherLiabilitiesCurrent