Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 43,683	$ 55,487	$ 36,629
Net income from discontinued operations, net of income taxes	(21,825)	(4,310)	(4,095)
Adjustments to reconcile net income from continuing operations to net cash provided by operating activities from continuing operations
Depreciation, depletion and amortization expense	213,820	165,621	84,606
Non-cash (gain) loss on derivatives, net	30,908	7,553	(12,971)
Accretion expense related to asset retirement obligations	471	372	235
Loss on sale of oil and gas properties	45,377	0	0
Stock-based compensation, net of amounts capitalized	29,373	11,689	11,864
Deferred income taxes	10,934	30,142	24,546
Non-cash interest expense, net of amounts capitalized	3,932	4,584	3,061
Other, net	3,704	6,036	4,033
Changes in operating assets and liabilities-
Accounts receivable	11,557	(67,120)	(23,910)
Accounts payable	13,595	26,942	33,457
Accrued liabilities	(12,588)	21,832	9,354
Other, net	(5,467)	(5,757)	(11,298)
Net cash provided by operating activities from continuing operations	367,474	253,071	155,511
Net cash used in operating activities from discontinued operations	(623)	(845)	(1,173)
Net cash provided by operating activities	366,851	252,226	154,338
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures - oil and gas properties	(786,976)	(735,711)	(516,004)
Capital expenditures - other property and equipment	(968)	(4,176)	(1,363)
Increase (decrease) in capital expenditure payables and accruals	32,261	(9,880)	49,346
Proceeds from sales of oil and gas properties, net	238,470	341,597	167,265
Advances to operators	447	(3,687)	390
Advances for joint operations	11,898	(46,110)	50,772
Other, net	(5,017)	(7,184)	(474)
Net cash used in investing activities from continuing operations	(509,885)	(465,151)	(250,068)
Net cash provided by (used in) investing activities from discontinued operations	124,533	(42,265)	(35,930)
Net cash used in investing activities	(385,352)	(507,416)	(285,998)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from borrowings and issuances	582,000	1,040,772	879,061
Debt repayments	(651,325)	(796,000)	(752,660)
Payments of debt issuance and retirement costs	(3,257)	(7,101)	(9,622)
Proceeds from common stock offerings, net of offering costs	189,686	0	0
Excess tax benefits from stock-based compensation	1,969	0	0
Proceeds from stock options exercised	1,253	107	47
Net cash provided by financing activities from continuing operations	120,326	237,778	116,826
Net cash provided by financing activities from discontinued operations	3,000	41,914	38,818
Net cash provided by financing activities	123,326	279,692	155,644
NET INCREASE IN CASH AND CASH EQUIVALENTS	104,825	24,502	23,984
CASH AND CASH EQUIVALENTS, beginning of year	52,095
CASH AND CASH EQUIVALENTS, end of year	157,439	52,095
SUPPLEMENTAL CASH FLOW DISCLOSURES
Cash paid for interest, net of amounts capitalized	50,770	43,629	26,077
Cash paid for income taxes	505	587	4,156
Cash and Cash Equivalents, at Carrying Value, Consolidated	$ 157,439	$ 52,614	$ 28,112