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Quarterly Financial Information (Summary Of Consolidated Quarterly Financial Information) (Details) (USD $) | 3 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended
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Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Sep. 30, 2009 | Jun. 30, 2009 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011 Reserve Impairment [Member] | Dec. 31, 2011 Australian Well Invention Equipment [Member] | Dec. 31, 2011 United Kingdom [Member] | Jun. 30, 2010 United Kingdom [Member] | Dec. 31, 2011 United Kingdom [Member] | Dec. 31, 2010 United Kingdom [Member] | Dec. 31, 2009 United Kingdom [Member] | Dec. 31, 2011 Sapura [Member]
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ 396,185,000 |  | $ 372,496,000 |  | $ 338,319,000 |  | $ 291,607,000 |  | $ 306,337,000 |  | $ 392,669,000 |  | $ 299,262,000 |  | $ 201,570,000 |  |  |  | $ 1,398,607,000 | $ 1,199,838,000 |  | $ 1,461,687,000 |  |  |  |  | $ 275,499,000 | $ 198,011,000 | $ 124,896,000 |
Gross profit | 31,023,000 | [1] | 122,295,000 | [1] | 100,198,000 | [1] | 77,076,000 | [1] | 16,082,000 | [2] | 86,552,000 | [2] | (94,818,000) | [2] | 25,856,000 | [2] |  |  | 330,592,000 | 33,672,000 |  | 243,162,000 |  |  |  |  |  |  |  |
Net income | 16,763,000 | [3] | 46,026,000 | [3] | 41,323,000 | [3] | 25,867,000 | [3] | (49,811,000) | [4] | 26,171,000 | [4] | (85,517,000) | [4] | (17,831,000) | [4] |  |  | 129,979,000 | (126,988,000) |  | 156,054,000 |  |  |  |  |  |  |  |
Net income applicable to common shareholders | 16,753,000 |  | 46,016,000 |  | 41,313,000 |  | 25,857,000 |  | (49,821,000) |  | 26,161,000 |  | (85,551,000) |  | (17,891,000) |  |  |  | 129,939,000 | (127,102,000) |  | 101,867,000 |  |  |  |  |  |  |  |
Basic earnings per common share | $ 0.16 |  | $ 0.43 |  | $ 0.39 |  | $ 0.24 |  | $ (0.48) |  | $ 0.25 |  | $ (0.82) |  | $ (0.17) |  |  |  | $ 1.23 | $ (1.22) |  | $ 1.01 |  |  |  |  |  |  |  |
Diluted earnings per common share | $ 0.16 |  | $ 0.43 |  | $ 0.39 |  | $ 0.24 |  | $ (0.48) |  | $ 0.25 |  | $ (0.82) |  | $ (0.17) |  |  |  | $ 1.22 | $ (1.22) |  | $ 0.96 |  |  |  |  |  |  |  |
Goodwill impairments |  |  |  |  |  |  |  |  | 16,700,000 |  |  |  |  |  |  |  |  |  |  | 16,743,000 | [5] |  |  |  |  |  |  |  |  |
Oil and gas impairments | 107,500,000 |  | 2,400,000 |  | 22,700,000 |  | 0 |  | 9,200,000 |  | 900,000 |  | 159,900,000 |  | 11,100,000 |  | 64,600,000 | 48,200,000 | 132,603,000 | 181,083,000 |  | 120,550,000 | 79,300,000 |  |  | 5,000,000 | 20,000,000 | 5,000,000 |  |
Impairment of long-lived assets held-for-use |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,600,000 |  |  |  |  |  |
Other than temporary impairment non-cash |  |  |  |  |  |  |  |  | 2,200,000 |  |  |  |  |  |  |  |  |  | 10,563,000 | 2,240,000 |  |  |  |  |  |  |  |  |  | 10,600,000
Increase in expected asset retirement cost | 28,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  | 15,900,000 |  |  |  |  |
Tax benefit related to reorganization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 31,300,000 |  |  |  |  |  |
[1] | Includes oil and gas property impairment charges totaling $22.7 million in the second quarter of 2011 and $2.4 million in the third quarter of 2011. Our fourth quarter of 2011 includes a total of $107.5 million of impairment charges, including $79.3 million related to eight oil and gas properties to reduce them to their estimated fair value at December 31, 2011 and $28.2 million to increase certain non-producing properties estimated asset retirement obligations, including $15.9 million related to our one U.K. oil and gas property (Note 5). The fourth quarter also includes a $6.6 million impairment charge to reduce our Australian well intervention equipment to is estimated fair value at December 31, 2011. There were no asset impairment charges in the first quarter of 2011.
[2] | Includes oil and gas property impairment charges totaled $11.1 in the first quarter of 2010, $159.9 million in the second quarter of 2010, $0.9 million in the third quarter of 2010 and $9.2 million in the fourth quarter of 2010.
[3] | Our fourth quarter 2011 includes a $10.6 million other than temporary impairment loss on our equity investment in our Australian joint venture (Note 7). The fourth quarter also includes a $31.3 million tax benefit related to reorganization of our Australian well intervention business.
[4] | Includes an impairment charges of $16.7 million to reduce goodwill associated with our Australia well intervention business in the fourth quarter of 2010 (Note 2).
[5] | Amount reflects full write off of goodwill associated with our WOSEA operations.

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- Definition The component of income tax expense representing amounts paid or payable (or refundable) which are classified as "income taxes" as determined by applying the provisions of enacted tax law to other than the taxable Income or Loss from continuing operations for the period. Items affecting income taxes and required to be disclosed, but not included elsewhere, would also be designated as "Other". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32672-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph c, d, e, f -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. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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