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Accumulated Other Comprehensive Income / (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accumulated Other Comprehensive Income (Loss), net of taxes:      
Balance at beginning of period $ 104,547 $ (3,683) $ 42,436
Net change in unrealized gain on cash flow hedges, net of taxes (90,641) 110,864 (61,378)
Net changes in defined benefit pension and postretirement plans, net of taxes 9,974 (2,689) 15,227
Net changes in foreign currency translation adjustment, net of taxes   55 32
Balance at end of period 23,880 104,547 (3,683)
Tax effect of Accumulated Other Comprehensive Income / (Loss) items:      
Net change in unrealized gain on cash flow hedges, tax effect 56,980 (70,463) 35,957
Net change in defined benefit pension and postretirement plans, tax effect (6,226) 2,225 (9,088)
Net changes in foreign currency translation adjustment, taxes   (34) (20)
Accumulated Net Gains / (Losses) on Cash Flow Hedges
      
Accumulated Other Comprehensive Income (Loss), net of taxes:      
Balance at beginning of period 121,358 10,494 71,872
Net change in unrealized gain on cash flow hedges, net of taxes (90,641) 110,864 (61,378)
Balance at end of period 30,717 121,358 10,494
Accumulated Defined Benefit Pension and Postretirement Plans
      
Accumulated Other Comprehensive Income (Loss), net of taxes:      
Balance at beginning of period (16,811) (14,122) (29,349)
Net changes in defined benefit pension and postretirement plans, net of taxes 9,974 (2,689) 15,227
Balance at end of period (6,837) (16,811) (14,122)
Accumulated Foreign Currency Translation Adjustment
      
Accumulated Other Comprehensive Income (Loss), net of taxes:      
Balance at beginning of period   (55) (87)
Net changes in foreign currency translation adjustment, net of taxes   55 32
Balance at end of period     $ (55)