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	$ 2,327	$ 1,100	$ 4,811	$ 2,081
Amortization of ROU assets	76	155	186	308
Interest on lease liabilities	1	1	3	3
Total finance lease cost	$ 77	$ 156	$ 189	$ 311