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Derivative Instruments and Hedging Activities (Details 3) (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]
Monthly net settlements -cash settled	$ (55)	$ 0	$ (104)	$ 0
Mark to market adjustments - non-cash	0	141	0	337
Total effect of derivative instruments on the combined statements of operations	$ (55)	$ 141	$ (104)	$ 337

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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