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Credit Facilities and Long-Term Debt, Total Debt Outstanding (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Credit Facilities and Long-Term Debt [Abstract]    
Revolving credit facilities $ 73,000 $ 54,812
Other 137 163
Total debt 73,137 54,975
Current maturities of debt 73,047 54,855
Long-term debt $ 90 $ 120