Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Leases [Abstract]
Operating lease cost	$ 2,562	$ 1,877	$ 5,028	$ 3,447
Finance lease cost
Amortization of right-of-use assets	101	80	190	160
Interest on lease liabilities	11	15	23	30
Total finance lease cost	112	95	213	190
Short-term lease cost	1,037	1,773	2,066	3,764
Total lease expense	$ 3,711	$ 3,745	$ 7,307	$ 7,401