Derivatives - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
2018 Treasury Locks
Derivative [Line Items]
Debt instrument, LIBOR Rate	ten-year U.S. Treasury
Swaps, Number of Instruments Held	2
Swaps, Notional Amount	$ 100,000
Swaps, Average Fixed Interest Rate	2.93%
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%