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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 $ (22,982) $ 268 $ (22,871) $ (12,377)
After-tax net unrealized (losses) gains related to derivatives accounted for as hedges (20) (18,757) (13) (5,737)
After-tax net realized (gains) losses on derivative transactions reclassified into earnings (118) (376) (236) (751)
Accumulated other comprehensive loss related to cash flow hedges at end of period $ (23,120) $ (18,865) $ (23,120) $ (18,865)