v2.3.0.11
Derivative Instruments and Hedging Activities Effect of Derivative Instruments on Statement of Income and Comprehenive Income (Details) (Interest Rate Swap, Cash Flow Hedging Relationships, USD $)
In Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Interest Rate Swap | Cash Flow Hedging Relationships
       
Derivative Instruments, Gain (Loss)        
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion) $ (21,673) $ (6,849) $ (20,697) $ (16,655)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) $ (6,081) $ (8,285) $ (10,757) $ (19,241)