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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Net Cash Provided by (Used in) Operating Activities [Abstract]    
Net Income (Loss) $ 132,811 $ (1,102,723)
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]    
Depletion, depreciation and amoritzation 121,591 227,469
Ceiling test and other impairments 0 1,869,136
Deferred gain on sale of liquids gathering system (5,276) 0
Deferred Income Tax Provision (Benefit) 0 (712,175)
Unrealized Gain (Loss) on Derivatives 2,860 89,809
Reduction in tax benefits from stock based compensation 0 4,027
Share-based Compensation 6,062 4,781
Other 1,074 1,079
Increase (Decrease) in Operating Capital [Abstract]    
Increase (Decrease) in Restricted Cash for Operating Activities 2 0
Increase (Decrease) in Accounts Receivable 3,201 72,885
Increase (Decrease) in Prepaid, Deferred Expense and Other Assets 994 2,004
Increase (Decrease) in Accounts Payable and Accrued Liabilities (40,618) (116,706)
Other long-term obligations 3,431 (9,359)
Increase (Decrease) in Accrued Income Taxes Payable (8,759) (39)
Increase (Decrease in Production Taxes Payable (8,479) (2,672)
Increase (Decrease in Interest Payable 240 133
Net Cash Provided by (Used in) Operating Activities 209,134 327,649
Net Cash Provided by (Used in) Investing Activities [Abstract]    
Oil and gas property expenditures (197,731) (469,290)
Gathering system expenditures (3,275) (91,296)
Change in capital cost accrual (51,383) 37,515
Proceeds from Sale of Productive Assets (129) 0
Inventory (520) (996)
Purchase of Capital Assets (195) (4,025)
Net Cash Provided by (Used in) Investing Activities (253,233) (528,092)
Net Cash Provided by (Used in) Financing Activities [Abstract]    
Proceeds from Issuance of Long-term Debt 498,000 560,000
Repayments of Long-term Debt (455,000) (346,000)
Payments for Repurchase of Equity (5,265) (6,296)
Reduction in tax benefits from stock based compensation 0 (4,027)
Proceeds from Stock Options Exercised 0 1,157
Net Cash Provided by (Used in) Financing Activities 37,735 204,834
Cash and Cash Equivalents, Period Increase (Decrease) (6,364) 4,391
Cash and Cash Equivalents, at Carrying Value 12,921 11,307
Cash and Cash Equivalents, at Carrying Value 6,557 15,698
SUPPLEMENTAL INFORMATION:    
Non-cash investing activities - oil and gas properties $ 12,651 $ 0