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Additional Balance Sheet Information (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
ACCOUNTS RECEIVABLE, NET    
Trade accounts $ 165,070 $ 111,306
Joint interest accounts 5,659 5,417
Other accounts 2,817 1,003
Accounts receivable, gross 173,546 117,726
Allowance for Doubtful Accounts (1,127) (3,345)
Accounts receivable, net 172,419 114,381
INVENTORIES    
Natural gas in storage 7,494 13,513
Tubular goods and well equipment 6,392 7,146
Other accounts 287 619
Inventory, net 14,173 21,278
OTHER CURRENT ASSETS    
Prepaid balances and other 2,158 2,345
Restricted cash   2,234
Other assets current 2,158 4,579
OTHER ASSETS    
Deferred compensation plan 10,608 10,838
Debt issuance costs 17,420 17,680
Equity method investment 6,915  
Other accounts 83 1,342
Other assets 35,026 29,860
ACCOUNTS PAYABLE    
Trade accounts 22,977 18,253
Natural gas purchases 4,892 3,012
Royalty and other owners 66,321 48,113
Accrued capital costs 164,862 138,122
Taxes other than income 1,284 2,076
Drilling advances 44,203 1,489
Producer gas imbalances 1,602 2,312
Other accounts 6,339 3,917
Accounts payable current 312,480 217,294
ACCRUED LIABILITIES    
Employee Benefits 16,011 26,035
Pension and postretirement benefits 1,304 6,331
Taxes other than income 8,735 12,297
Interest payable 22,329 24,701
Derivative contracts 192 385
Other accounts 1,218 1,169
Accrued liabilities 49,789 70,918
OTHER LIABILITIES    
Deferred compensation plan 23,893 20,187
Other accounts 16,282 11,752
Other liabilities $ 40,175 $ 31,939