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Leases Supplemental Lease Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Debt Instrument [Line Items]        
Operating Lease, Expense $ 630 $ 567 $ 1,300 $ 1,100
Operating lease costs 761   1,559  
Short-term lease costs $ 106   $ 180  
Weighted average remaining lease term (in years) 7 years 9 months 21 days   7 years 9 months 21 days  
Weighted-average discount rate 3.40%   3.40%  
Lease liabilities arising from obtaining right-of-use assets $ 6,730   $ 14,698  
Notes Payable 9.56 Percent Due 2031 [Member]        
Debt Instrument [Line Items]        
Notes Payable to Bank $ 28,000   $ 28,000