Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net income (loss), including noncontrolling interests	$ 111,966	$ 68,744
Adjustments to reconcile net income (loss), including noncontrolling interests to net cash provided by operating activities
Depreciation and amortization	134,960	167,170
Asset impairment charge and dry hole expense	14,679	18,204
Amortization of deferred financing costs	3,292	4,777
Stock-based compensation expense	3,658	4,938
Amortization of debt discount	4,776	4,414
Deferred income taxes	21,624	23,864
Excess tax benefit from stock-based compensation	657	1,196
Gain on investment in Cal Dive common stock		(753)
Loss on sale of assets, net	1,714	6
Loss on early extinguishment of debt	17,127
Unrealized gain and ineffectiveness on derivative contracts, net	(7,581)	(34)
Changes in operating assets and liabilities:
Accounts receivable, net	46,611	(18,207)
Other current assets	(5,854)	12,712
Income tax payable	1,083	(4,154)
Accounts payable and accrued liabilities	(61,372)	(27,070)
Oil and gas asset retirement costs	(54,976)	(16,073)
Other noncurrent, net	(11,344)	10,839
Net cash provided by (used in) operating activities	221,020	250,573
Cash flows from investing activities:
Capital expenditures	(150,107)	(106,122)
Distributions from equity investments, net	2,045	(1,106)
Proceeds from sale of Cal Dive common stock		3,588
Decrease (increase) in restricted cash	2,660	863
Net cash used in investing activities	(145,402)	(102,777)
Cash flows from financing activities:
Early extinguishment of Senior Unsecured Notes	(209,500)
Borrowing under revolving credit facility	100,000	109,400
Issuance of Convertible Senior Notes due 2032	200,000
Repurchase of Convertible Senior Notes due 2025	(143,945)
Proceeds from Term Loan A	100,000
Repayment of revolving credit facility		(109,400)
Repayment of Term Loan	(2,750)	(111,191)
Repayment of MARAD borrowings	(2,409)	(2,294)
Deferred financing costs	(6,485)	(9,014)
Repurchases of common stock	(7,510)	(1,012)
Excess tax benefit from stock-based compensation	(657)	(1,196)
Exercise of stock options, net and other	372	439
Net cash provided by (used in) financing activities	27,116	(124,268)
Effect of exchange rate changes on cash and cash equivalents	304	(424)
Net increase in cash and cash equivalents	103,038	23,104
Cash and cash equivalents:
Balance, beginning of year	546,465	391,085
Balance, end of period	$ 649,503	$ 414,189