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Derivatives - Additional Information (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
2014 Swaps  
Derivative [Line Items]  
Debt instrument, LIBOR Rate one month LIBOR
Swaps, Number of Instruments Held 4
Swaps, Notional Amount $ 200,000
Swaps, Average Fixed Interest Rate 2.29%
2015 Swaps  
Derivative [Line Items]  
Debt instrument, LIBOR Rate one month LIBOR
Swaps, Number of Instruments Held 6
Swaps, Notional Amount $ 260,000
Swaps, Average Fixed Interest Rate 1.79%