Derivatives - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)
Derivative [Line Items]
Payments to Settle Derivative Instruments	$ (3,149)	$ 0	$ (3,149)	$ 0
2018 Treasury Locks
Derivative [Line Items]
Swaps, Number of Instruments Held	2		2
Swaps, Notional Amount	$ 100,000		$ 100,000
Debt instrument, LIBOR Rate			ten-year U.S. Treasury
Payments to Settle Derivative Instruments	$ 3,149
Swaps, Average Fixed Interest Rate	2.93%		2.93%
2014 Swaps
Derivative [Line Items]
Swaps, Number of Instruments Held	4		4
Swaps, Notional Amount	$ 200,000		$ 200,000
Debt instrument, LIBOR Rate			one month LIBOR
Swaps, Average Fixed Interest Rate	2.29%		2.29%
2015 Swaps
Derivative [Line Items]
Swaps, Number of Instruments Held	6		6
Swaps, Notional Amount	$ 260,000		$ 260,000
Debt instrument, LIBOR Rate			one month LIBOR
Swaps, Average Fixed Interest Rate	1.79%		1.79%