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Commitments And Contingencies (Narrative) (Details) (USD $)	6 Months Ended						1 Months Ended		11 Months Ended	16 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Collectibility of Receivables [Member]	Jun. 30, 2013 Purchaser [Member]	Jun. 30, 2013 Helix [Member]	Dec. 31, 2012 Helix [Member]	Aug. 31, 2012 Helix 534 [Member]	Jun. 30, 2013 Helix 534 [Member]	Jun. 30, 2013 Q5000 [Member]	Jun. 30, 2013 Q5000 [Member]	Dec. 31, 2010 Allowance for Doubtful Accounts [Member]
Long-term Purchase Commitment, Amount										$ 386,500,000
Property and equipment	1,858,537,000	2,051,796,000						164,600,000	146,000,000	146,000,000
Payments to Acquire Property, Plant, and Equipment							85,000,000		115,900,000
Guarantor Obligations, Maximum Exposure, Undiscounted				100,000,000	50,000,000
Trade receivables collected	303,000,000
Valuation Allowances and Reserves, Deductions											4,000,000
Value added tax assessment	28,000,000
Accounts Receivable Net Current	$ 163,486,000	$ 152,233,000	$ 17,500,000		$ 65,060,000	$ 39,203,000

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Value added tax assessment

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Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-02.3-4)

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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-Section 50

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The minimum amount the entity agreed to spend under the long-term purchase commitment.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow associated with the proceeds from sale and collection of receivables during the period.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

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