Derivatives (Details) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Forward Contracts [Member] instrument	Apr. 30, 2013 Forward Contracts [Member] instrument
Derivative [Line Items]
Number of interest rate derivatives held			4	4
Derivative, Notional Amount			$ 240,000,000	$ 240,000,000
Interest rate cash flow hedge liability, fair value				3,156,000
Amount of cash flow hedge reported in AOCI				3,141,000
Fair value of interest rate hedges recognized in other comprehensive income	8,528,000
Interest expense	306,000	171,000
Interest rate hedges gain (loss) to be reclassified into interest expense over next 12 months	$ 703,000