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Revolving Debt Schedule of Revolving Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Revolving debt $ 103,473 $ 24,041
Senior Secured Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Revolving debt 94,300 9,800
Foreign Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Revolving debt $ 9,173 $ 14,241