Leases - Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Leases [Abstract]
Operating lease cost	$ 1,382	$ 1,381
Short-term lease cost	1,977	1,935
Short-term lease cost - related party	890	902
Total lease cost	4,249	$ 4,218
Cash paid for amounts included in the measurement of lease liabilities - operating leases	$ 1,349
Weighted-average remaining lease term - operating leases	5 years 6 months 17 days
Weighted-average discount rate - operating leases	5.39%