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Cash and Cash Equivalents and Fair Value of Financial Instruments - Foreign Currency Risk Management (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Interest rate swap contracts $ 1,378,000 $ 1,245,000
Foreign Exchange Forward    
Derivatives, Fair Value [Line Items]    
Derivative, notional amount 0 $ 0
Interest Rate Swap    
Derivatives, Fair Value [Line Items]    
Derivative, notional amount $ 100,000,000  
Derivative, fixed interest rate 0.80%  
LIBOR | Interest Rate Swap    
Derivatives, Fair Value [Line Items]    
Derivative, variable rate floor 0.00%