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, including noncontrolling interests	$ 187,590	$ 75,784
Adjustments to reconcile net income, including noncontrolling interests, to net cash provided by (used in) operating activities:
Income from discontinued operations, net of tax		(1,073)
Depreciation and amortization	81,274	71,542
Amortization of deferred financing costs	3,653	4,091
Stock-based compensation expense	5,711	7,297
Amortization of debt discount	4,149	3,850
Deferred income taxes	24,728	(23,911)
Excess tax from stock-based compensation	(120)	(168)
Gain on disposition of assets, net	(10,418)	(14,727)
Loss on early extinguishment of debt		12,100
Unrealized loss and ineffectiveness on derivative contracts, net	69	140
Changes in operating assets and liabilities:
Accounts receivable, net	(16,496)	2,046
Other current assets	(19,388)	7,904
Income tax payable	25,440	(37,806)
Accounts payable and accrued liabilities	26,083	(46,313)
Oil and gas asset retirement costs	(956)	(9,886)
Other noncurrent, net	(9,758)	(561)
Net cash provided by operating activities	301,561	50,309
Net cash used in discontinued operations		(30,503)
Net cash provided by operating activities	301,561	19,806
Cash flows from investing activities:
Capital expenditures	(204,528)	(275,935)
Distributions from equity investments, net	5,041	6,110
Proceeds from sale of assets	11,074	189,054
Acquisition of noncontrolling interests	20,085
Net cash used in investing activities	(208,498)	(80,771)
Net cash provided by discontinued operations		582,965
Net cash provided by (used in) investing activities	(208,498)	502,194
Cash flows from financing activities:
Early extinguishment of Senior Unsecured Notes		(281,490)
Borrowings under revolving credit facility		47,617
Repayment of revolving credit facility		(147,617)
Repurchase of Convertible Senior Notes due 2025		(3,487)
Proceeds from term loans		300,000
Repayment of term loans	(11,250)	(370,931)
Repayment of MARAD borrowings	(5,376)	(5,120)
Deferred financing costs	(3,143)	(10,948)
Distributions to noncontrolling interest	(1,018)	(3,059)
Repurchases of common stock	(8,538)	(5,562)
Excess tax from stock-based compensation	120	168
Exercise of stock options, net and other		95
Proceeds from issuance of ESPP shares	3,223	2,711
Net cash used in financing activities	(25,982)	(477,623)
Effect of exchange rate changes on cash and cash equivalents	1,248	(1,296)
Net increase in cash and cash equivalents	68,329	43,081
Cash and cash equivalents:
Balance, beginning of year	478,200	437,100
Balance, end of period	$ 546,529	$ 480,181