Long-Term Debt (Maturities Of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2012 Helix Term Loan [Member]		Dec. 31, 2012 Helix Revolving Loans [Member]		Dec. 31, 2012 Senior Unsecured Notes [Member]	Dec. 31, 2011 Senior Unsecured Notes [Member]	Dec. 31, 2010 Senior Unsecured Notes [Member]	Dec. 31, 2012 Convertible Senior Notes 2025 [Member]		Dec. 31, 2011 Convertible Senior Notes 2025 [Member]	Dec. 31, 2012 MARAD Debt [Member]	Dec. 31, 2012 Convertible Senior Notes 2032 [Member]		Mar. 31, 2012 Convertible Senior Notes 2032 [Member]	Dec. 31, 2012 Helix [Member]	Dec. 31, 2011 Helix [Member]
Debt Instrument [Line Items]
Less than one year	$ 16,607			$ 8,000	[1]						$ 3,487	[2]		$ 5,120
One to two years	13,376			8,000	[1]									5,376
Two to three years	456,825			351,181	[1]	100,000	[1]							5,644
Three to four years	280,886							274,960						5,926
Four to five years	6,222													6,222
Over five years	277,000													77,000	200,000	[3]
Total debt	1,050,916			367,181	[1]	100,000	[1]	274,960			3,487	[2]		105,288	200,000	[3]
Current maturities	(16,607)		(7,877)	(8,000)	[1]						(3,487)	[2]		(5,120)				(11,487)	(3,000)
Long-term debt, less current maturities	1,034,309			359,181	[1]	100,000	[1]	274,960						100,168	200,000	[3]
Unamortized debt discount	(31,688)	[4]	(9,555)										(9,600)		(31,688)	[3],[4]	(35,400)
Long-term debt	$ 1,002,621		$ 1,147,444	$ 359,181	[1]	$ 100,000	[1]	$ 274,960	$ 475,000	$ 550,000				$ 100,168	$ 168,312	[3]		$ 902,453	$ 1,042,155

[1] Term Loan amounts reflect both our Term Loan A and Term Loan B. In February 2013, we repaid $293.9 million of our Term Loans and $24.5 million under our Revolving Credit Facility with the after-tax proceeds from the sale of ERT.

[2] We repurchased the remainder of the 2025 Notes in February 2013 (see “2025 Notes” above).

[3] Beginning in March 2018, the holders of these Convertible Senior Notes may require us to repurchase these notes or we may at our own option elect to repurchase notes. These notes will mature in March 2032.

[4] The notes will increase to their principal amount through accretion of non-cash interest charges through March 2018 for the Convertible Senior Notes due 2032.