Derivative Financial Instruments - Schedule of Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Derivatives
Notional Amount	$ 326,950		$ 326,950		$ 303,639
Asset, Fair Value	111		111		164
Liability, Fair Value	(2,007)		(2,007)		(1,082)
Changes in fair value of derivatives
Change in fair value of interest rate derivatives	498	$ (51)	(2,264)	$ (238)
Unrealized gain (loss) on cash flow hedge	0	(1,026)	0	(1,574)
Total change in fair value	498	(1,077)	(2,264)	(1,812)
Interest Rate Swaps
Derivatives
Notional Amount	56,950		56,950		57,093
Asset, Fair Value	0		0		0
Liability, Fair Value	(2,007)		(2,007)		(1,082)
Changes in fair value of derivatives
Total change in fair value	481	(1,026)	(2,007)	(1,574)
Interest Rate Caps
Derivatives
Notional Amount	270,000		270,000		246,546
Asset, Fair Value	111		111		164
Liability, Fair Value	0		0		$ 0
Changes in fair value of derivatives
Total change in fair value	$ 17	$ (51)	$ (257)	$ (238)