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Cash and Cash Equivalents and Fair Value of Financial Instruments - Financial Assets and Liabilities Measured At Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swap contracts $ 1,378 $ 1,245
Total financial assets 1,378 1,245
Total financial liabilities   2,400
Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swap contracts 0 0
Total financial assets 0 0
Total financial liabilities   0
Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swap contracts 1,378 1,245
Total financial assets 1,378 1,245
Total financial liabilities   0
Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swap contracts 0 0
Total financial assets $ 0 0
Total financial liabilities   2,400
Contingent consideration liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial liabilities   2,400
Contingent consideration liability | Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial liabilities   0
Contingent consideration liability | Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial liabilities   0
Contingent consideration liability | Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial liabilities   $ 2,400