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Reportable Segments and Geographic Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Sales Information by Geographical Area |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers | $ 702,941 | $ 704,478 | $ 657,572 | $ 618,479 | $ 615,780 | $ 625,623 | $ 643,822 | $ 576,308 | $ 2,683,470 | $ 2,461,533 | $ 2,715,601
Total assets | 4,356,649 |  |  |  | 4,741,536 |  |  |  | 4,356,649 | 4,741,536 | 5,234,410
Gross margin |  |  |  |  |  |  |  |  | 738,060 | 804,461 | 915,582
Capital expenditures |  |  |  |  |  |  |  |  | 282,791 | 235,990 | 368,901
North America Contract Operations [Member] |  |  |  |  |  |  |  |  |  |  |
Sales Information by Geographical Area |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers |  |  |  |  |  |  |  |  | 603,529 | 608,065 | 695,315
Total assets | 2,052,170 |  |  |  | 2,061,755 |  |  |  | 2,052,170 | 2,061,755 | 2,357,751
Gross margin |  |  |  |  |  |  |  |  | 293,460 | 307,379 | 396,601
Capital expenditures |  |  |  |  |  |  |  |  | 192,470 | 111,087 | 108,985
International Contract Operations [Member] |  |  |  |  |  |  |  |  |  |  |
Sales Information by Geographical Area |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers |  |  |  |  |  |  |  |  | 445,059 | 465,144 | 391,995
Total assets | 887,046 |  |  |  | 976,700 |  |  |  | 887,046 | 976,700 | 988,257
Gross margin |  |  |  |  |  |  |  |  | 260,654 | 289,787 | 242,742
Capital expenditures |  |  |  |  |  |  |  |  | 58,767 | 106,530 | 236,450
Aftermarket Services [Member] |  |  |  |  |  |  |  |  |  |  |
Sales Information by Geographical Area |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers |  |  |  |  |  |  |  |  | 409,423 | 322,097 | 308,873
Total assets | 111,890 |  |  |  | 160,864 |  |  |  | 111,890 | 160,864 | 148,548
Gross margin |  |  |  |  |  |  |  |  | 60,761 | 45,790 | 62,987
Capital expenditures |  |  |  |  |  |  |  |  | 2,082 | 1,348 | 2,629
Fabrication [Member] |  |  |  |  |  |  |  |  |  |  |
Sales Information by Geographical Area |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers |  |  |  |  |  |  |  |  | 1,225,459 | 1,066,227 | 1,319,418
Total assets | 384,099 |  |  |  | 580,255 |  |  |  | 384,099 | 580,255 | 720,482
Gross margin |  |  |  |  |  |  |  |  | 123,222 | 161,505 | 213,252
Capital expenditures |  |  |  |  |  |  |  |  | 22,077 | 12,187 | 10,592
Reportable Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Sales Information by Geographical Area |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers |  |  |  |  |  |  |  |  | 2,683,470 | 2,461,533 | 2,715,601
Total assets | 3,435,205 |  |  |  | 3,779,574 |  |  |  | 3,435,205 | 3,779,574 | 4,215,038
Gross margin |  |  |  |  |  |  |  |  | 738,097 | 804,461 | 915,582
Capital expenditures |  |  |  |  |  |  |  |  | 275,396 | 231,152 | 358,656
Other [Member] |  |  |  |  |  |  |  |  |  |  |
Sales Information by Geographical Area |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers |  |  |  |  |  |  |  |  | 0 |  |
Total assets | 921,444 |  |  |  | 946,872 |  |  |  | 921,444 | 946,872 | 1,019,372
Gross margin |  |  |  |  |  |  |  |  | 0 |  |
Capital expenditures |  |  |  |  |  |  |  |  | $ 7,395 | $ 4,838 | $ 10,245

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