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Leases: Lessee - Lease Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Leases [Abstract]    
Operating lease cost $ 385 $ 696
Amortization of right-of-use asset 27 44
Interest on lease liabilities 6 9
Total lease cost $ 418 $ 749