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ADDITIONAL BALANCE SHEET INFORMATION (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Accounts receivable, net    
Trade accounts $ 242,367 $ 215,361
Joint interest accounts 3,469 7,261
Income taxes receivable 532 922
Other accounts 516 746
Accounts receivable, gross 246,884 224,290
Allowance for doubtful accounts (1,811) (1,814)
Accounts receivable, net 245,073 222,476
Inventories    
Natural gas in storage 3,169 9,056
Tubular goods and well equipment 7,193 8,396
Other accounts 30 16
Inventory, net 10,392 17,468
Other current assets    
Prepaid balances and other 1,415 2,587
Derivative instruments   3,019
Other current assets 1,415 5,606
Other assets    
Deferred compensation plan 12,886 12,507
Debt issuance costs 15,350 16,476
Equity method investment 32,971 26,892
Other accounts 169 79
Other assets 61,376 55,954
Accounts payable    
Trade accounts 56,956 26,023
Natural gas purchases 2,933 2,052
Royalty and other owners 83,902 79,150
Accrued capital costs 120,091 146,899
Taxes other than income 18,869 13,677
Drilling advances 8,334 14,093
Producer gas imbalances 69 69
Other accounts 6,531 6,838
Accounts payable current 297,685 288,801
Accrued liabilities    
Employee benefits 24,645 43,599
Taxes other than income 6,797 6,894
Interest payable 12,637 20,211
Other accounts 3,124 2,897
Accrued liabilities 47,203 73,601
Other liabilities    
Deferred compensation plan 30,983 33,211
Other accounts 6,899 13,043
Other liabilities $ 37,882 $ 46,254