Consolidated statements of cash flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities
Net income	$ 79,485	$ 35,142
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation, depletion & amortization	180,631	139,439
Loss on impairment of other assets	0	1,090
Deferred income taxes	46,894	19,398
Gain on hedge reclassification adjustments	0	(28,544)
Non-hedge derivative (gains) losses	(17,218)	26,484
Gain on sale of assets	(1,007)	(556)
Other	3,033	3,395
Change in assets and liabilities
Accounts receivable	(14,442)	(20,858)
Inventories	(7,287)	(1,689)
Prepaid expenses and other assets	998	561
Accounts payable and accrued liabilities	(906)	17,694
Revenue distribution payable	5,446	5,181
Stock-based compensation	3,504	1,747
Net cash provided by operating activities	279,131	198,484
Cash flows from investing activities
Expenditures for property, plant, and equipment and oil and natural gas properties	(499,255)	(382,167)
Proceeds from asset dispositions	258,578	91,788
Settlement of non-hedge derivative instruments	(25,038)	13,097
Other	0	(664)
Net cash used in investing activities	(265,715)	(277,946)
Cash flows from financing activities
Proceeds from long-term debt	186,999	133,208
Repayment of long-term debt	(227,572)	(51,416)
Proceeds from Long-term Capital Lease Obligations	0	5,203
Principal payments under capital lease obligations	(1,726)	(38)
Net cash (used in) provided by financing activities	(42,299)	86,957
Net (decrease) increase in cash and cash equivalents	(28,883)	7,495
Cash and cash equivalents at beginning of period	48,595	29,819
Cash and cash equivalents at end of period	$ 19,712	$ 37,314