Business Segment Information (Summary Of Intercompany Segment Revenues) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Intercompany segment revenues	$ 133,775	$ 111,695	$ 123,170
Contracting Services [Member]
Segment Reporting Information [Line Items]
Intercompany segment revenues	87,718	65,638	109,012
Production Facilities [Member]
Segment Reporting Information [Line Items]
Intercompany segment revenues	$ 46,057	$ 46,057	$ 14,158

Amount of revenue from transactions with other operating segments of the same entity.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 131

-Paragraph 27

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration