Leases - Lease Costs (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	$ 1,423	$ 1,285	$ 4,197	$ 4,008
Short-term lease cost	2,108	2,255	6,122	6,427
Short-term lease cost - related party	892	895	2,681	2,718
Total lease cost	4,423	$ 4,435	$ 13,000	$ 13,153
Cash paid for amounts included in the measurement of lease liabilities - operating leases	$ 1,416
Weighted-average remaining lease term - operating leases	5 years 1 month 28 days		5 years 1 month 28 days
Weighted-average discount rate - operating leases	5.24%		5.24%