Derivative Financial Instruments - Schedule of Derivatives (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 18, 2017	Jun. 23, 2017	Feb. 07, 2017	Dec. 31, 2016
Derivatives
Notional Amount	$ 426,124,000		$ 426,124,000					$ 326,901,000
Asset, Fair Value	717,000		717,000					259,000
Liability, Fair Value	(447,000)		(447,000)					(829,000)
Total change in fair value of interest rate derivatives	87,000	$ 498,000	300,000	$ (2,264,000)
Interest rate swaps
Derivatives
Notional Amount	56,124,000		56,124,000					56,901,000
Asset, Fair Value	10,000		10,000					0
Liability, Fair Value	(447,000)		(447,000)					(829,000)
Total change in fair value of interest rate derivatives	124,000	481,000	392,000	(2,007,000)
Interest rate caps
Derivatives
Notional Amount	370,000,000		370,000,000		$ 50,000,000	$ 50,000,000	$ 50,000,000.0	270,000,000
Asset, Fair Value	707,000		707,000					259,000
Liability, Fair Value	0		0					$ 0
Total change in fair value of interest rate derivatives	$ (37,000)	$ 17,000	$ (92,000)	$ (257,000)