Summary Of Significant Accounting Policies (Property And Equipment - Narrative) (Details) (USD $)	12 Months Ended			1 Months Ended		8 Months Ended	10 Months Ended	15 Months Ended	1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Jan. 31, 2014	Jan. 31, 2014	Jul. 31, 2013	Dec. 31, 2013	Jan. 31, 2015
Property, Plant and Equipment [Line Items]
Cost of Property Repairs and Maintenance	$ 44,600,000	$ 31,500,000	$ 39,300,000
Capitalized Computer Software, Gross	17,400,000	17,500,000		17,400,000				17,500,000
Capitalized Computer Software, Net	3,900,000	4,800,000		3,900,000				4,800,000
Capitalized Computer Software, Amortization	1,300,000	1,800,000	2,600,000
Proceeds from sale of assets	13,574,000	189,054,000	19,530,000
Deposit liability current		5,000,000						5,000,000
Noncash consideration received	27,500,000
Note receivable, current	17,500,000			17,500,000
Note receivable, noncurrent	10,000,000			10,000,000
Capitalized interest	10,419,000	10,419,000	4,893,000
Spoolbase Facility [Member]
Property, Plant and Equipment [Line Items]
Proceeds from sale of assets				2,500,000		15,000,000
Sales Price Of Property Plant And Equipment					45,000,000
Note receivable, interest rate	6.00%			6.00%
Note receivable					30,000,000	30,000,000
Note receivable, current									10,000,000
Note receivable, noncurrent									10,000,000
Express, Caesar And Other Pipelay Equipment [Member]
Property, Plant and Equipment [Line Items]
Asset impairment			157,800,000
Proceeds from sale of assets							238,300,000
Caesar [Member]
Property, Plant and Equipment [Line Items]
Gain (Loss) on sale of assets and asset impairment charges		(1,100,000)
Aggregate fair value of properties			138,300,000
Express [Member]
Property, Plant and Equipment [Line Items]
Proceeds from sale of assets								100,000,000
Gain (Loss) on sale of assets and asset impairment charges		15,600,000
Equipment In Australia [Member]
Property, Plant and Equipment [Line Items]
Asset impairment			4,600,000
Aggregate fair value of properties			5,000,000
Intrepid Vessel [Member]
Property, Plant and Equipment [Line Items]
Asset impairment			14,600,000
Proceeds from sale of assets			14,500,000
Gain (Loss) on sale of assets and asset impairment charges			(13,500,000)
Aggregate fair value of properties			28,000,000
Subsequent Event [Member] | Spoolbase Facility [Member]
Property, Plant and Equipment [Line Items]
Proceeds from sale of assets									7,500,000
Note receivable									$ 20,000,000