Income Taxes (Reconciliation Of Beginning And Ending Amount Of Unrecognized Tax Benefits) (Details) (Helix [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Helix [Member]
Balance at January 1,	$ 7,085	$ 4,085	$ 3,417
Additions based on tax positions related to current year		2,785
Additions for tax positions of prior years	206	215	668
Reductions for tax positions of prior years	(2,785)
Balance at December 31,	$ 4,506	$ 7,085	$ 4,085