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Debt - Short-Term Borrowings (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Short-term Debt [Line Items]    
Short-term borrowings $ 0 $ 8,600,000
Line of Credit    
Short-term Debt [Line Items]    
Line of credit facility, maximum borrowing capacity 47,500,000 21,400,000
Short-term borrowings $ 0 $ 8,600,000