Derivative Financial Instruments (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) swaps	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Number of derivative instruments obtained | swaps	6
Derivative maturity date	Jan. 01, 2019
Amount of borrowings outstanding, subject to swaps	$ 225,000,000
Weighted average interest rate under derivative instruments (in hundredths)	1.678%
Cross-default minimum threshold	$ 10,000,000
Expected increase to interest expense	2,300,000
Derivatives designated as cash flow hedges in accounts payable, accrued expenses and other liabilities [Abstract]
Interest rate swaps	3,073,000	$ 2,412,000
Amount of unrealized gains/(losses) recognized in AOCL on derivatives (effective portion) [Abstract]
Interest rate swaps	(4,040,000)	(5,662,000)	$ 5,778,000
Amount of losses reclassified out of AOCL into contractual interest expense (effective portion) [Abstract]
Interest rate swaps	$ 3,696,000	$ 3,777,000	$ 3,370,000