Leases - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Lease, Cost [Abstract]
Operating lease costs	$ 30,339	$ 29,908
Variable lease costs	5,577	4,889
Sublease income	(557)	(577)
Total operating lease cost	35,359	34,220
Cash paid for amounts included in the measurement of lease liabilities	31,212	31,223
ROU lease assets obtained in exchange for new operating lease liabilities	$ 9,211	$ 22,948