Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income, including noncontrolling interests	$ 30,392	$ 111,946
Adjustments to reconcile net income, including noncontrolling interests to net cash provided by operating activities
Less: Income from discontinued operations, net of tax	(1,029)	(91,069)
Depreciation and amortization	49,692	47,388
Asset impairment charge		14,590
Amortization of deferred financing costs	2,824	3,292
Stock-based compensation expense	5,473	3,658
Amortization of debt discount	2,557	4,776
Deferred income taxes	16,058	21,624
Excess tax from stock-based compensation	(383)	657
Loss on sale of assets	1,085
Loss on early extinguishment of debt	3,528	17,127
Unrealized loss and ineffectiveness on derivative contracts, net	638	149
Changes in operating assets and liabilities:
Accounts receivable, net	(19,702)	64,420
Other current assets	15,479	(19,571)
Income tax payable	(56,454)	1,083
Accounts payable and accrued liabilities	(35,081)	(22,072)
Oil and gas asset retirement costs	(5,950)	(19,241)
Other noncurrent, net	(7,117)	(19,940)
Net cash provided by (used in) operating activities	2,010	118,817
Net cash provided (used in) by discontinued operations	(30,503)	102,203
Net cash provided by (used in) operating activities	(28,493)	221,020
Cash flows from investing activities:
Capital expenditures	(102,383)	(115,779)
Distributions from equity investments, net	4,567	2,045
Proceeds from sale of assets	108,250
Net cash provided by (used in) investing activities	10,434	(113,734)
Net cash used in discontinued operations	582,965	(31,668)
Net cash provided by (used in) investing activities	593,399	(145,402)
Cash flows from financing activities:
Early extinguishment of Senior Unsecured Notes		(209,500)
Borrowing 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 loan		100,000
Repayment of term loans	(367,181)	(2,750)
Repayment of MARAD borrowings	(2,529)	(2,409)
Deferred financing costs	(10,932)	(6,485)
Distributions to noncontrolling interest	(2,033)
Repurchases of common stock	(5,562)	(7,510)
Excess tax from stock-based compensation	383	(657)
Exercise of stock options, net and other	(186)	372
Net cash provided by (used in) financing activities	(491,527)	27,116
Effect of exchange rate changes on cash and cash equivalents	3,048	304
Net increase in cash and cash equivalents	76,427	103,038
Cash and cash equivalents:
Balance, beginning of year	437,100	546,465
Balance, end of period	$ 513,527	$ 649,503