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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
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 201,696 | [1] | $ 217,110 | [1] | $ 197,461 | [1] | $ 229,842 | [1] | $ 200,113 | [2] | $ 213,278 | [2] | $ 165,861 | [2] | $ 122,748 | [2] | $ 846,109 | $ 702,000 | $ 774,469
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (68,483) | 63,040 | 51,079
Net interest expense and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65,912 | 73,642 | 66,638
Equity in earnings of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,434 | 22,215 | 19,469
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (125,961) | 1,050 | 1,670
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (59,158) | (36,806) | 19,166
Total assets | 3,386,580 |  |  |  |  |  |  |  | 3,582,347 |  |  |  |  |  |  |  | 3,386,580 | 3,582,347 | 3,592,020
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 323,039 | 100,154 | 122,218
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 97,201 | 91,188 | 81,878
Contracting Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 899,793 | 738,235 | 780,339
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,702) | 107,013 | 77,391
Net interest expense and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 702 | 765 | 1,299
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (8,529) | 97,798 | 72,459
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (15,707) | 29,235 | 42,828
Total assets | 1,982,822 |  |  |  |  |  |  |  | 2,023,251 |  |  |  |  |  |  |  | 1,982,822 | 2,023,251 | 1,872,141
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 322,216 | 69,259 | 65,949
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 77,442 | 73,291 | 66,333
Production Facilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80,091 | 75,460 | 117,300
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,082 | 38,404 | 63,863
Net interest expense and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 365 | 442 | 865
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48,276 | 58,064 | 86,100
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,784 | 19,233 | 29,049
Total assets | 503,531 |  |  |  |  |  |  |  | 534,776 |  |  |  |  |  |  |  | 503,531 | 534,776 | 512,990
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 823 | 30,896 | 56,269
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,828 | 14,935 | 9,907
Intercompany Elimination [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (133,775) | (111,695) | (123,170)
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,878) | 93 | (19,095)
Corporate And Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net interest expense and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 64,845 | 72,435 | 64,474
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (165,708) | (154,812) | (156,889)
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (59,235) | (85,274) | (52,711)
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,931 | 2,962 | 5,638
Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets | 900,227 |  |  |  |  |  |  |  | 1,024,320 |  |  |  |  |  |  |  | 900,227 | 1,024,320 | 1,206,889
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (92,985) | $ (82,470) | $ (71,080)
[1] | 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.
[2] | Excludes revenues from discontinued operations of $168.9 million, $172.5 million, $159.2 million and $196.1 million for the quarters ended March 31, June 30, September 30 and December 31, 2011.

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