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]
Operating lease cost	$ 3,665	$ 1,858	$ 8,693	$ 5,305
Finance lease cost
Amortization of right-of-use assets	110	92	300	252
Interest on lease liabilities	11	16	34	46
Total finance lease cost	121	108	334	298
Short-term lease cost	922	1,793	2,988	5,557
Total lease expense	4,708	$ 3,759	$ 12,015	$ 11,160
Accelerated lease costs	$ 1,100