Leases - Lease Expense Components (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 11,364	$ 9,518
Short-term lease cost	339	263
Variable lease cost	595	846
Less: sublease income	(1,132)	(1,108)
Total lease cost, net	11,166	9,519
Cash paid for operating leases	12,221	10,354
Operating leases	$ 21,613	$ 0
Weighted-average remaining term (in years) - operating leases	6 years 3 months 7 days		6 years 3 months 14 days
Weighted-average discount rate - operating leases	2.83%		2.92%