Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Derivative assets - interest rate swaps	$ 4,516	$ 1,592
Derivative liabilities - interest rate swaps	0	242
Interest rate swaps [Member] | Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Derivative assets - interest rate swaps	4,516	1,592
Derivative liabilities - interest rate swaps	$ 0	$ 242