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Fair Value of Financial Assets and Liabilities, Financial Impact of Qualifying Cash Flow Hedges (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Financial Impact of Qualifying Cash Flow Hedges on Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Accumulated other comprehensive loss related to cash flow hedges at beginning of period $ (61,533) $ (20,165) $ (61,241) $ (45,738)
After-tax net unrealized (losses) gains related to derivatives accounted for as hedges (44) (35,727) (31) (10,335)
After-tax net realized (gains) losses on derivative transactions reclassified into earnings 694 182 389 363
Accumulated other comprehensive loss related to cash flow hedges at end of period $ (60,883) $ (55,710) $ (60,883) $ (55,710)