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Leases - Lease Liabilities (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Lease, cost    
Amortization of right-of-use assets $ 514 $ 536
Interest on lease liabilities 94 131
Operating lease cost 853 929
Short-term lease cost 282 171
Variable lease cost 93 82
Total lease cost 1,836 1,849
Operating cash flows from finance leases 94 131
Operating cash flows from operating leases 634 949
Financing cash flows from finance leases 340 344
Right-of-use assets obtained in exchange for new operating lease liabilities $ 60 $ 49
Weighted-average remaining lease term - finance leases 4 years 1 month 6 days 4 years 10 months 24 days
Weighted-average remaining lease term - operating leases 2 years 3 months 17 days 2 years 6 months
Weighted-average discount rate - finance leases 6.10% 6.10%
Weighted-average discount rate - operating leases 8.50% 8.60%