Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash Flows From Operating Activities
Net income (loss)	$ (55,932)	$ (47,671)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and non-stock-based amortization	29,468	35,468
Stock-based compensation expense	3,949	6,659
Provision for/(Recovery of) doubtful accounts	103	341
Gain on sale or disposal of property and equipment	(12,520)	(23,964)
Derivative (gain) loss	571	413
Loss on asset impairments	5,467	48,869
Gain on sale of investment in subsidiaries	(47,848)
Equity in earnings of unconsolidated affiliate	(3,158)
Deferred income taxes	4,115	(18,990)
Other	(74)	1,543
Changes in operating assets and liabilities
Accounts receivable, unbilled work, and contract costs	6,705	92,154
Prepaid expenses and other	(15,262)	(7,760)
Accounts payable, employee-related liabilities, and other accrued liabilities	(35,365)	(23,802)
Deferred dry-docking costs incurred	(9,592)	(2,169)
Net cash provided by (used in) operating activities	(129,373)	61,091
Cash Flows From Investing Activities
Proceeds from the sale of assets	2,770	35,512
Proceeds from the sale of investment in subsidiaries	59,000
Advance deposits on asset sales		5,750
Additions to property and equipment	(60,746)	(132,280)
Sale of marketable securities		41,414
Purchase of marketable securities	(31,365)
Decrease in (additions to) restricted cash	(13,905)	(3,407)
Net cash provided by (used in) investing activities	(44,246)	(53,011)
Cash Flows From Financing Activities
Repayment of long-term debt	(3,960)	(3,960)
Payments on long-term payables for property and equipment acquisitions		(26,031)
Proceeds from sale of common stock, net	122	19
Repurchase of common stock	(1,041)	(725)
Additions to deferred charges	(149)	(563)
Other		60
Net cash provided by (used in) financing activities	(5,028)	(31,200)
Effect of exchange rate changes on cash	(2,490)	634
Cash and cash equivalents
Increase (decrease)	(181,137)	(22,486)
Beginning of period	349,609	344,855
End of period	168,472	322,369
Supplemental Disclosures
Interest paid, net of amounts capitalized	13,514	10,227
Income tax payments (refunds), net	(4,995)	2,347
Property and equipment additions included in accounts payable	$ 35,018	$ 55,150