Allowance Accounts (Schedule Of Allowance Accounts) (Details) (USD $)	3 Months Ended	12 Months Ended				1 Months Ended	12 Months Ended						1 Months Ended	12 Months Ended
	Mar. 31, 2010	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2007	Dec. 31, 2011	Jun. 30, 2009 Allowance For Uncollectible Accounts [Member]	Dec. 31, 2011 Allowance For Uncollectible Accounts [Member]		Dec. 31, 2010 Allowance For Uncollectible Accounts [Member]		Dec. 31, 2009 Allowance For Uncollectible Accounts [Member]		Jun. 30, 2009 Deferred Tax Asset Valuation Allowance [Member]	Dec. 31, 2011 Deferred Tax Asset Valuation Allowance [Member]		Dec. 31, 2010 Deferred Tax Asset Valuation Allowance [Member]		Dec. 31, 2009 Deferred Tax Asset Valuation Allowance [Member]		Dec. 31, 2011 WOSEA [Member]	Dec. 31, 2011 Oil And Gas Operations In United Kingdom [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance, December 31,							$ 4,527,000		$ 5,172,000		$ 5,905,000			$ 8,497,000				$ 3,317,000
Additions							61,000	[1]	4,108,000	[2]	9,220,000			5,813,000	[1]	8,497,000	[2]			4,900,000	900,000
Deductions						5,900,000	(521,000)		(4,753,000)	[3]	(9,953,000)	[4]	3,300,000					(3,317,000)	[4]
Balance, December 31,							4,067,000		4,527,000		5,172,000			14,310,000		8,497,000
Bad debt allowance		4,527,000			4,067,000
Valuation allowance		7,300,000
Percentage Of Oil And Gas Field Working Interest		50.00%	25.00%	100.00%
Bad debt allowance related to a large international construction contract		4,000,000
Bad debt expense related to settlement of third party claims	$ 3,700,000	$ 3,700,000

[1] The valuation allowance includes $4.9 million related to our WOSEA operations and $0.9 million to our oil and gas operations in the United Kingdom. WOSEA has a full valuation allowance against its deferred tax asset balance.

[2] Amounts include a $4.0 million bad debt allowance related to a large international construction contract and the valuation allowance includes a $7.3 million valuation allowance related to our WOSEA operations with the remaining allowance being related to our acquisition of the remaining 50% of the Camelot field in the United Kingdom.

[3] Includes the $3.7 million of bad debt expense related to settlement of third party claims related to a terminated international construction contract in Australia (Note 16).

[4] Amounts include reductions of $5.9 million to the allowance for uncollectible accounts and $3.3 million to the deferred tax valuation allowance to reflect the deconsolidation of Cal Dive in June 2009 (Note 3).