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Accounting for Derivatives (Details 2) (Interest rate hedges, Derivatives designated as cash flow hedges, USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Interest rate hedges | Derivatives designated as cash flow hedges
   
Effect of derivative instruments on results of operations    
Pre-tax Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives $ 216 $ (1,944)
Pre-tax Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (loss) into Income (Loss) $ (1,472) $ (9,747)