Long-Term Debt (Maturities Of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012	Jun. 30, 2013 Senior Unsecured Notes [Member]		Jun. 30, 2013 MARAD Debt [Member]	Jun. 30, 2013 Convertible Senior Notes 2032 [Member]		Jun. 30, 2012 Convertible Senior Notes 2032 [Member]	Jun. 30, 2013 Helix [Member]	Dec. 31, 2012 Helix [Member]
Debt Instrument [Line Items]
Less than one year	$ 5,247					$ 5,247
One to two years	5,508					5,508
Two to three years	280,743			274,960	[1]	5,783
Three to four years	6,072					6,072
Four to five years	6,375					6,375
Over five years	273,774					73,774	200,000	[2]
Total debt	577,719			274,960	[1]	102,759	200,000	[2]
Current maturities	(5,247)		(16,607)			(5,247)					(11,487)
Long-term debt, less current maturities	572,472			274,960	[1]	97,512	200,000	[2]
Unamortized debt discount	(29,131)	[3]					(29,131)	[2],[3]	(35,400)
Long-term debt	$ 543,341		$ 1,002,621	$ 274,960	[1]	$ 97,512	$ 170,869	[2]		$ 445,828	$ 902,453

[1] In June 2013, we elected to redeem the remaining Senior Unsecured Notes on July 22, 2013, and we redeemed these notes in full on that date. See Senior Unsecured Notes below for additional disclosures regarding the early extinguishment of this debt.

[2] Beginning in March 2018, the holders of the Convertible Senior Notes due 2032 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.

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