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Business Segment Information (Summary Of Financial Data By Segment) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  |
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Well Intervention [Member] | Dec. 31, 2012 Well Intervention [Member] | Dec. 31, 2011 Well Intervention [Member] | Dec. 31, 2013 Robotics [Member] | Dec. 31, 2012 Robotics [Member] | Dec. 31, 2011 Robotics [Member] | Dec. 31, 2013 Subsea Construction [Member] | Dec. 31, 2012 Subsea Construction [Member] | Dec. 31, 2011 Subsea Construction [Member] | Jun. 30, 2013 Caesar [Member] | Dec. 31, 2012 Caesar [Member] | Jul. 31, 2013 Express [Member] | Dec. 31, 2012 Intrepid Vessel [Member] | Dec. 31, 2013 Production Facilities [Member] | Dec. 31, 2012 Production Facilities [Member] | Dec. 31, 2011 Production Facilities [Member] | Dec. 31, 2013 Corporate And Eliminations [Member] | Dec. 31, 2012 Corporate And Eliminations [Member] | Dec. 31, 2011 Corporate And Eliminations [Member] | Dec. 31, 2013 Corporate [Member] | Dec. 31, 2012 Corporate [Member] | Dec. 31, 2011 Corporate [Member] | Dec. 31, 2013 Intercompany Elimination [Member] | Dec. 31, 2012 Intercompany Elimination [Member] | Dec. 31, 2011 Intercompany Elimination [Member] | Dec. 31, 2012 Discontinued Operations [Member] | Dec. 31, 2011 Discontinued Operations [Member]
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 226,837 | [1] | $ 220,117 | [1] | $ 232,178 | [1] | $ 197,429 | [1] | $ 201,696 | [2] | $ 217,110 | [2] | $ 197,461 | [2] | $ 229,842 | [2] | $ 876,561 | $ 846,109 | $ 702,000 | $ 452,452 | $ 378,546 | $ 340,952 | $ 333,246 | $ 328,726 | $ 245,360 | $ 71,321 |  | $ 192,521 |  | $ 151,923 |  |  |  |  |  | $ 88,149 | $ 80,091 | $ 75,460 |  |  |  |  |  |  | $ (68,607) | $ (133,775) | $ (111,695) |  |
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 179,034 | (68,483) | 63,040 | 131,840 | 85,482 | 80,030 | 44,132 | 55,678 | 36,518 | 33,685 | [3] | (148,862) | [3] | (9,535) | [3] |  |  |  |  | 49,778 | 40,082 | 38,404 |  |  |  | (77,041) | (92,985) | (82,470) | (3,360) | (7,878) | 93 |  |
Net interest expense and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38,411 | 65,949 | 73,682 | (217) | 2,152 | (1,062) | (210) | (1,203) | 1,847 | 480 |  | (247) |  | (20) |  |  |  |  |  | 380 | 365 | 442 | 37,978 | 64,882 | 72,475 |  |  |  |  |  |  |  |
Equity in earnings of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,965 | 8,434 | 22,215 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 143,588 | (125,998) | 1,010 | 132,057 | 83,205 | 72,642 | 44,342 | 56,881 | 34,671 | 33,205 |  | (148,615) |  | (9,515) |  |  |  |  |  | 52,363 | 48,276 | 58,064 | (118,379) | (165,745) | (154,852) |  |  |  |  |  |  |  |
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 31,612 | (59,158) | (36,806) | 26,718 | 15,400 | 21,154 | 15,530 | 20,222 | 10,978 | 11,655 |  | (51,329) |  | (2,897) |  |  |  |  |  | 17,233 | 15,784 | 19,233 | (39,524) | (59,235) | (85,274) |  |  |  |  |  |  |  |
Total assets | 2,544,280 |  |  |  |  |  |  |  | 3,386,580 |  |  |  |  |  |  |  | 2,544,280 | 3,386,580 | 3,582,347 | 1,245,229 | 936,926 | 682,449 | 282,373 | 258,117 | 207,205 | 38,054 |  | 303,479 |  | 548,043 |  |  |  |  |  | 495,829 | 504,828 | 536,026 |  |  |  | 482,795 | 483,003 | 584,304 |  |  |  | 900,227 | 1,024,320
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 324,426 | 323,039 | 100,154 | 283,132 | 274,451 | 13,923 | 39,655 | 44,500 | 27,045 |  |  |  |  |  |  |  |  |  |  | 1,252 | 823 | 30,896 |  |  |  | 387 | 3,265 | 28,290 |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 98,535 | 97,201 | 91,188 | 44,619 | 37,736 | 35,544 | 22,263 | 19,933 | 16,426 | 8,651 |  | 19,773 |  | 21,321 |  |  |  |  |  | 17,193 | 16,828 | 14,935 | 5,809 | 2,931 | 2,962 |  |  |  |  |  |  |  |
Gain on sale or acquisition of assets, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,727 | (13,476) | (6) |  |  |  |  |  |  |  |  |  |  |  |  | (1,100) |  | 15,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  |  |  |  |  |  | $ 158,000 |  | $ 4,600 |  | $ 14,600 |  |  |  |  | $ 177,135 | $ 6,564 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 157,800 |  | $ 14,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Excludes revenues from discontinued operations of $48.8 million for the quarter ended March 31, 2013.
[2] | Excludes revenues from discontinued operations of $178.1 million, $149.9 million, $119.1 million and $110.1 million for the quarters ended March 31, June 30, September 30 and December 31, 2012.
[3] | Amount in 2013 includes the $1.1 million loss on the sale of the Caesar in June 2013 and the $15.6 million gain on the sale of the Express in July 2013. Amount in 2012 includes impairment charges of $157.8 million for the Caesar and $14.6 million for the Intrepid (Note 2).

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