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Derivative Instruments - Designated as hedging, Financial Performance (Details) (Interest Rate Swap [Member], Designated as Hedging Instrument [Member], USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Interest Expense [Member]
Jun. 30, 2011
Interest Expense [Member]
Jun. 30, 2012
Interest Expense [Member]
Jun. 30, 2011
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]            
Amount of Loss Recognized in AOCI on Derivative (Effective Portion, net of tax) $ (860) $ 0        
Amount of Loss Reclassified from AOCI into Earnings     $ (110) $ (120) $ (110) $ (360)