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- Lease Costs (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 $ 954 $ 942 $ 1,911 $ 1,862
Short-term lease cost 39 59 96 133
Depreciation of leased assets 109 131 218 263
Interest on lease liabilities 125 131 251 263
Total finance lease cost 234 262 469 526
Total lease cost $ 1,227 $ 1,263 $ 2,476 $ 2,521