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Accumulated Other Comprehensive Income / (Loss) (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Line items in income statement impacted by reclassifications out of accumulated other comprehensive income      
Natural gas revenues $ 1,405,262 $ 933,640 $ 796,517
Crude oil and condensate revenues 291,418 227,933 125,972
Income before income taxes 485,538 237,840 235,187
Tax (expense) / benefit (205,765) (106,110) (112,779)
NET INCOME 279,773 131,730 122,408
Amount Reclassified from Accumulated Other Comprehensive Income
      
Line items in income statement impacted by reclassifications out of accumulated other comprehensive income      
Income before income taxes 56,361 222,199 68,075
Tax (expense) / benefit (22,199) (86,459) (26,415)
NET INCOME 34,162 135,740 41,660
Net Gains/ (Losses) on Cash Flow Hedges | Amount Reclassified from Accumulated Other Comprehensive Income | Commodity contracts
      
Line items in income statement impacted by reclassifications out of accumulated other comprehensive income      
Natural gas revenues 52,733 225,108 84,937
Crude oil and condensate revenues 4,269 11,218 1,403
Accumulated Defined Benefit Pension and Postretirement Plans | Amount Reclassified from Accumulated Other Comprehensive Income
      
Line items in income statement impacted by reclassifications out of accumulated other comprehensive income      
Settlement     (5,523)
Amortization of net obligation at transition     (632)
Amortization of prior service cost   (221) (1,046)
Amortization of net loss (641) (13,906) (10,975)
Foreign currency translation adjustment     $ (89)