Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Variable lease costs	$ 590	$ 1,091	$ 2,473	$ 3,277
Operating lease costs	10,458	8,758	31,759	28,357
Financing lease costs:
Amortization of right-of-use assets	185	180	505	657
Interest on lease liabilities	9	14	31	69
Total financing lease costs	194	194	536	726
Total lease costs	$ 11,242	$ 10,043	$ 34,768	$ 32,360