Financing and Operating Leases - Components of Operating and Finance Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating lease cost:
Total operating lease costs	$ 671	$ 665	$ 1,342	$ 1,308
Finance lease cost:
Right-of-use amortization expense	329	178	656	301
Interest on lease liabilities	117	40	246	62
Total financing lease cost	$ 446	$ 218	$ 902	$ 363