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Credit Facilities and Long-Term Debt, Total Debt Outstanding (Details)
$ in Thousands, zł in Millions
Mar. 31, 2018
USD ($)
Mar. 31, 2018
PLN (zł)
Dec. 31, 2017
USD ($)
Credit Facilities and Long-Term Debt [Abstract]      
Revolving credit facilities $ 90,000   $ 57,000
Other [1] 5,922   4,778
Total debt 95,922   61,778
Current maturities of debt 95,880   61,699
Long-term debt 42   $ 79
Overdraft facility $ 5,800 zł 19.8  
[1] Other includes borrowings under our Polish overdraft facility of Zloty 19.8 million (approximately $5.8 million).