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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
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Financial Impact of Qualifying Cash Flow Hedges on Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Accumulated other comprehensive (loss) income related to cash flow hedges at Jan. 1 $ (22,871) $ (12,377) $ 7,457
After-tax net unrealized gains (losses) related to derivatives accounted for as hedges 9 (9,311) (18,328)
After-tax net realized gains on derivative transactions reclassified into earnings (476) (1,183) (1,506)
Accumulated other comprehensive loss related to cash flow hedges at Dec. 31 $ (23,338) $ (22,871) $ (12,377)