Derivative Financial Instruments - Schedule of Derivatives (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 23, 2017	Feb. 07, 2017	Dec. 31, 2016
Derivatives
Notional Amount	$ 376,170,000		$ 376,170,000				$ 326,901,000
Asset, Fair Value	559,000		559,000				259,000
Liability, Fair Value	(574,000)		(574,000)				(829,000)
Changes in fair value of derivatives
Change in fair value of interest rate derivatives	(81,000)	$ (373,000)	213,000	$ (2,762,000)
Total change in fair value	(81,000)	(373,000)	213,000	(2,762,000)
Interest rate swaps
Derivatives
Notional Amount	56,170,000		56,170,000				56,901,000
Asset, Fair Value	13,000		13,000				0
Liability, Fair Value	(574,000)		(574,000)				(829,000)
Changes in fair value of derivatives
Total change in fair value	7,000	(244,000)	268,000	(2,488,000)
Interest rate caps
Derivatives
Notional Amount	320,000,000		320,000,000		$ 50,000,000	$ 50,000,000.0	270,000,000
Asset, Fair Value	546,000		546,000				259,000
Liability, Fair Value	0		0				$ 0
Changes in fair value of derivatives
Total change in fair value	$ (88,000)	$ (129,000)	$ (55,000)	$ (274,000)