Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Leases [Abstract]
Amortization of right-of-use assets	$ 2,654	$ 2,366
Interest on lease liabilities	596	651
Operating lease cost	5,471	5,211
Variable lease cost	795	1,004
Total lease cost	9,516	$ 9,232
Operating lease, residual value of leased asset	$ 3,200