Leases - Lease Costs (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Leases [Abstract]
Operating lease cost	$ 5,823
Short-term lease cost	8,281
Short-term lease cost - related party	3,589
Total lease cost	17,693
Cash paid for amounts included in the measurement of lease liabilities - operating leases	$ 1,421
Weighted-average remaining lease term - operating leases	5 years 7 months 6 days
Weighted-average discount rate - operating leases	5.45%