Derivative Instruments and Hedging Activities (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2010	Oct. 18, 2010	Dec. 31, 2012	Dec. 31, 2011
Total effect of derivative instruments on other comprehensive income	$ (172)	$ 0	$ 154	$ (215)
Interest Rate Cap [Member]
Total effect of derivative instruments on other comprehensive income	(57)	0	(4)	(99)
Interest Rate Swap [Member]
Total effect of derivative instruments on other comprehensive income	$ (115)	$ 0	$ 158	$ (116)