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Leases - Value of Lease Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Operating Leases    
2019 $ 4,032 $ 2,574
2020 4,044 2,369
2021 3,981 2,349
2022 1,880  
2023 845 1,130
Subsequent years 55 374
Total lease payments (1) 14,837 10,804
Less: Interest 1,314  
Present value of lease liabilities 13,523  
Financing Leases    
2019 267 1,395
2020 240 1,444
2021 126 1,493
2022 79 760
2023 25 0
Subsequent years 0 0
Total lease payments (1) 737 $ 5,092
Less: Interest 52  
Present value of lease liabilities 685  
Total    
2019 4,299  
2020 4,284  
2021 4,107  
2022 1,959  
2023 870  
Subsequent years 55  
Total lease payments (1) 15,574  
Less: Interest 1,366  
Present value of lease liabilities $ 14,208