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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Current Assets:    
Cash and cash equivalents $ 91 $ 3,277
Accounts receivable 73,082 70,897
Deferred tax asset 5,572 4,974
Other current assets 10,081 7,600
Total Current Assets 88,826 86,748
Property and Equipment:    
Property and Equipment 5,813,305 5,714,099
Less - Accumulated depreciation, depletion, and amortization (3,236,443) (3,174,453)
Property and Equipment, Net 2,576,862 2,539,646
Other Long-Term Assets 15,585 17,199
Total Assets 2,681,273 2,643,593
Current Liabilities:    
Accounts payable and accrued liabilities 81,182 83,361
Accrued capital costs 56,533 61,164
Accrued interest 13,140 21,561
Undistributed oil and gas revenues 13,170 10,990
Total Current Liabilities 164,025 177,076
Long-Term Debt 1,175,036 [1] 1,142,368 [1]
Deferred Tax Liabilities 224,230 217,384
Asset Retirement Obligation 64,503 63,225
Other Long-Term Liabilities 9,831 10,324
Commitments and Contingencies 0 0
Stockholders' Equity:    
Preferred stock, $0.01 par value 0 0
Common stock, $0.01 par value 442 439
Additional paid-in capital 764,058 761,972
Treasury stock held, at cost (9,645) (12,575)
Retained earnings 288,793 283,380
Total Stockholders' Equity 1,043,648 1,033,216
Total Liabilities and Stockholders' Equity $ 2,681,273 $ 2,643,593
[1] Amounts are shown net of any debt discount or premium