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Cash and Cash Equivalents and Fair Value of Financial Instruments - Narrative (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents $ 43,773 $ 32,424 $ 46,348 $ 54,488
Assets, Fair Value Disclosure   $ 1,378 $ 1,464  
Interest Rate Swap        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative, notional amount       $ 100,000
Derivative, fixed interest rate       0.80%
London Interbank Offered Rate (LIBOR) | Interest Rate Swap        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative, basis spread on variable rate       0.00%