Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Leases [Abstract]
Amortization of right-of-use assets	$ 2,139	$ 2,611	$ 4,793	$ 4,977
Interest on lease liabilities	462	699	1,058	1,350
Operating lease cost	6,199	5,053	11,670	10,264
Variable lease cost	776	603	1,571	1,607
Sublease (income)	(16)	0	(16)	0
Total lease cost, net	9,560	$ 8,966	19,076	$ 18,198
Operating lease, residual value of leased asset	$ 7,000		$ 7,000