Derivative Financial Instruments - Schedule of Derivatives (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 07, 2018	Dec. 31, 2017
Derivatives
Notional Amount	$ 376,033,000			$ 401,079,000
Asset, Fair Value	2,735,000			1,525,000
Liability, Fair Value	0			(69,000)
Total change in fair value of interest rate derivatives	969,000	$ 294,000
Interest rate swaps
Derivatives
Notional Amount	56,033,000			56,079,000
Asset, Fair Value	289,000			10,000
Liability, Fair Value	0			(69,000)
Total change in fair value of interest rate derivatives	348,000	261,000
Interest rate caps
Derivatives
Notional Amount	320,000,000		$ 50,000,000.0	345,000,000
Asset, Fair Value	2,446,000			1,515,000
Liability, Fair Value	0			$ 0
Total change in fair value of interest rate derivatives	$ 621,000	$ 33,000