Summary Of Significant Accounting Policies (Summary Of Gross Components Of Property And Equipment) (Details) (USD $) In Thousands, unless otherwise specified							12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 ROVs/Vessels [Member]	Dec. 31, 2011 ROVs/Vessels [Member]	Dec. 31, 2012 Machinery, Equipment, Buildings And Leasehold Improvements [Member]	Dec. 31, 2011 Machinery, Equipment, Buildings And Leasehold Improvements [Member]	Dec. 31, 2012 Maximum [Member] ROVs/Vessels [Member]	Dec. 31, 2012 Maximum [Member] Machinery, Equipment, Buildings And Leasehold Improvements [Member]	Dec. 31, 2012 Minimum [Member] ROVs/Vessels [Member]	Dec. 31, 2012 Minimum [Member] Machinery, Equipment, Buildings And Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	$ 2,051,796	$ 1,815,012	$ 1,822,642	$ 1,616,772	$ 229,154	$ 198,240
Property, Plant and Equipment, Useful Life							30 years	30 years	10 years	5 years