Derivative Instruments (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Interest Rate Derivatives [Abstract]
Number of interest rate swap contracts	3
aggregate notional amount	$ 100,800		$ 101,400
Termination value of interest rate swap, including accrued interest	8,300
Interest Rate Cash Flow Hedges [Abstract]
Fair value of interest rate swaps	8,100		$ 7,100
Amount estimated to be reclassified from accumulated other comprehensive income as an increase to interest expense	1,000
Interest Rate Swap [Member] | Other Comprehensive Income (Loss) [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss related to the effective portion recognized in other comprehensive loss	(1,643)	$ (1,299)
Interest Rate Swap [Member] | Interest Expense [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss related to the effective portion subsequently reclassified to interest expense	(283)	(352)
Amount of loss related to the ineffective portion recognized in interest expense	$ (56)	$ (59)