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Lines of Credit and Long-Term Debt - Capital Leases (Details) - Capital Lease Obligation - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Capital Lease Obligations          
Interest expense, capital lease $ 49 $ 56 $ 158 $ 148  
Net book value of assets under capital leases $ 2,213   $ 2,213   $ 2,364
Minimum          
Capital Lease Obligations          
Lease interest rates (as a percent) 6.00%   6.00%    
Maximum          
Capital Lease Obligations          
Lease interest rates (as a percent) 19.00%   19.00%