Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash Flows From Operating Activities
Net income (loss)	$ (60,404)	$ (19,952)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and non-stock-based amortization	20,338	22,471
Stock-based compensation expense	2,546	5,483
Provision for/(Recovery of) doubtful accounts	(97)	1,212
Gain on sale or disposal of property and equipment	(12,492)	(146)
Derivative (gain) loss	369	834
Loss on asset impairments	5,468	10,934
Deferred income taxes	2,921	(22,728)
Other	10	561
Changes in operating assets and liabilities
Accounts receivable, unbilled work, and contract costs	(48,023)	78,744
Prepaid expenses and other	3,596	(25,128)
Accounts payable, employee-related liabilities, and other accrued liabilities	24,019	(47,590)
Deferred dry-docking costs incurred	(7,698)	(2,186)
Net cash provided by (used in) operating activities	(69,447)	2,509
Cash Flows From Investing Activities
Proceeds from the sale of assets	2,142	919
Advance deposits on asset sales	0	13,750
Additions to property and equipment	(40,536)	(104,851)
Sale of marketable securities	0	40,664
Purchase of marketable securities	(29,936)	0
Decrease in (additions to) restricted cash	(23,655)	(4,131)
Net cash provided by (used in) investing activities	(91,985)	(53,649)
Cash Flows From Financing Activities
Repayment of long-term debt	(1,980)	(1,980)
Payments on long-term payables for property and equipment acquisitions	0	(26,031)
Proceeds from sale of common stock, net	39	10
Repurchase of common stock	(974)	(607)
Additions to deferred charges	(149)	(563)
Net cash provided by (used in) financing activities	(3,064)	(29,171)
Effect of exchange rate changes on cash	1,562	183
Cash and cash equivalents
Increase (decrease)	(162,934)	(80,128)
Beginning of period	349,609	344,855
End of period	186,675	264,727
Supplemental Disclosures
Interest paid, net of amounts capitalized	6,784	3,153
Income tax payments (refunds), net	(5,735)	3,562
Property and equipment additions included in accounts payable	$ 43,702	$ 27,252