Derivative Instruments and Hedging Activities (Details 2) (Interest Rate Swap [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Interest Rate Swap [Member]
Amount of Income (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income (Loss)	$ (54)	$ 0	$ (68)	$ 0