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ADDITIONAL BALANCE SHEET INFORMATION (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Accounts receivable, net    
Trade accounts $ 211,559 $ 215,361
Joint interest billing 1,886 7,261
Income taxes receivable   922
Other accounts 208 746
Accounts receivable, gross 213,653 224,290
Allowance for doubtful accounts (1,553) (1,814)
Accounts receivable, net 212,100 222,476
Inventories    
Natural gas in storage 2,810 9,056
Tubular goods and well equipment 8,889 8,396
Other accounts 215 16
Inventory, net 11,914 17,468
Other current assets    
Prepaid balances and other 2,571 2,587
Derivative instruments 954 3,019
Other current assets 3,525 5,606
Other assets    
Deferred compensation plan 13,152 12,507
Debt issuance costs 14,225 16,476
Other accounts 71 79
Other assets 27,448 29,062
Accounts payable    
Trade accounts 43,789 26,023
Natural gas purchases 3,424 2,052
Royalty and other owners 79,274 79,150
Accrued capital costs 114,283 146,899
Taxes other than income 9,586 13,677
Drilling advances 107 14,093
Producer gas imbalances 69 69
Other accounts 5,149 6,838
Accounts payable current 255,681 288,801
Accrued liabilities    
Employee benefits 26,699 43,599
Taxes other than income 10,013 6,894
Interest payable 20,049 20,211
Other accounts 2,973 2,897
Accrued liabilities 59,734 73,601
Other liabilities    
Deferred compensation plan 31,388 33,211
Other accounts 6,451 13,043
Other liabilities $ 37,839 $ 46,254