Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net income, including noncontrolling interests	$ 75,784	$ 127,611
Adjustments to reconcile net income, including noncontrolling interests to net cash provided by operating activities:
Income from discontinued operations	(1,073)	(95,572)
Depreciation and amortization	71,542	72,185
Asset impairment charge		19,184
Amortization of deferred financing costs	4,091	4,990
Stock-based compensation expense	7,297	5,561
Amortization of debt discount	3,850	7,253
Deferred income taxes	(23,911)	26,495
Excess tax from stock-based compensation	(168)	1,151
Gain (loss) on sale of assets	(14,727)	12,933
Loss on early extinguishment of debt	12,100	17,127
Unrealized (gain) loss and ineffectiveness on derivative contracts, net	140	(200)
Changes in operating assets and liabilities:
Accounts receivable, net	2,046	(37,873)
Other current assets	7,904	(17,598)
Income tax payable	(37,806)	(12,591)
Accounts payable and accrued liabilities	(46,313)	(15,867)
Oil and gas asset retirement costs	(9,886)	(35,746)
Other noncurrent, net	(561)	(23,580)
Net cash provided by operating activities	50,309	55,463
Net cash provided (used in) by discontinued operations	(30,503)	252,689
Net cash provided by operating activities	19,806	308,152
Cash flows from investing activities:
Capital expenditures	(275,935)	(216,951)
Distributions from equity investments, net	6,110	6,174
Proceeds from sale of assets	189,054	14,500
Net cash provided by investing activities	(80,771)	(196,277)
Net cash used in discontinued operations	582,965	(85,695)
Net cash provided by (used in) investing activities	502,194	(281,972)
Cash flows from financing activities:
Early extinguishment of Senior Unsecured Notes	(281,490)	(209,500)
Borrowings under revolving credit facility	47,617	100,000
Repayment of revolving credit facility	(147,617)
Issuance of Convertible Senior Notes due 2032		200,000
Repurchase of Convertible Senior Notes due 2025	(3,487)	(143,945)
Proceeds from term loans	300,000	100,000
Repayment of term loans	(370,931)	(10,585)
Repayment of MARAD borrowings	(5,120)	(4,877)
Deferred financing costs	(10,948)	(7,766)
Distributions to noncontrolling interest	(3,059)	(4,249)
Repurchases of common stock	(5,562)	(7,510)
Excess tax from stock-based compensation	168	(1,151)
Exercise of stock options, net and other	95	1,264
Proceeds from issuance of ESPP shares	2,711
Net cash provided by (used in) financing activities	(477,623)	11,681
Effect of exchange rate changes on cash and cash equivalents	(1,296)	(532)
Net increase in cash and cash equivalents	43,081	37,329
Cash and cash equivalents:
Balance, beginning of year	437,100	546,465
Balance, end of period	$ 480,181	$ 583,794