Fair Value - Recorded Amount of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets - interest rate swaps	$ 2,143	$ 642
Derivative liabilities - interest rate swaps	(1,300)	(2,241)
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets - interest rate swaps	2,143	642
Derivative liabilities - interest rate swaps	$ (1,300)	$ (2,241)