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Reportable Segments and Geographic Information (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 segment | Dec. 31, 2011 | Dec. 31, 2010
Reportable Segments and Geographic Information |  |  |  |  |  |  |  |  |  |  |
Number of business segments |  |  |  |  |  |  |  |  | 4 |  |
Sales and other financial information by reportable segment |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers | $ 838,922 | $ 718,704 | $ 630,735 | $ 615,241 | $ 689,063 | $ 689,820 | $ 644,068 | $ 606,928 | $ 2,803,602 | $ 2,629,879 | $ 2,417,183
Gross margin |  |  |  |  |  |  |  |  | 834,223 | 728,427 | 797,088
Total assets excluding discontinued operations | 4,233,101 |  |  |  | 4,242,778 |  |  |  | 4,233,101 | 4,242,778 | 4,611,742
Capital expenditures |  |  |  |  |  |  |  |  | 428,731 | 272,185 | 231,607
North America contract operations |  |  |  |  |  |  |  |  |  |  |
Sales and other financial information by reportable segment |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers |  |  |  |  |  |  |  |  | 605,367 | 588,034 | 592,055
Gross margin |  |  |  |  |  |  |  |  | 316,123 | 284,984 | 300,431
Total assets excluding discontinued operations | 1,846,447 |  |  |  | 1,982,513 |  |  |  | 1,846,447 | 1,982,513 | 1,981,757
Capital expenditures |  |  |  |  |  |  |  |  | 247,021 | 182,178 | 106,720
International contract operations |  |  |  |  |  |  |  |  |  |  |
Sales and other financial information by reportable segment |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers |  |  |  |  |  |  |  |  | 463,957 | 445,059 | 465,144
Gross margin |  |  |  |  |  |  |  |  | 279,349 | 260,654 | 289,787
Total assets excluding discontinued operations | 918,187 |  |  |  | 887,046 |  |  |  | 918,187 | 887,046 | 976,700
Capital expenditures |  |  |  |  |  |  |  |  | 138,694 | 58,767 | 106,530
Aftermarket services |  |  |  |  |  |  |  |  |  |  |
Sales and other financial information by reportable segment |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers |  |  |  |  |  |  |  |  | 385,861 | 371,327 | 293,757
Gross margin |  |  |  |  |  |  |  |  | 82,271 | 59,567 | 45,365
Total assets excluding discontinued operations | 98,104 |  |  |  | 92,169 |  |  |  | 98,104 | 92,169 | 144,554
Capital expenditures |  |  |  |  |  |  |  |  | 3,304 | 1,768 | 1,332
Fabrication |  |  |  |  |  |  |  |  |  |  |
Sales and other financial information by reportable segment |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers |  |  |  |  |  |  |  |  | 1,348,417 | 1,225,459 | 1,066,227
Gross margin |  |  |  |  |  |  |  |  | 156,480 | 123,222 | 161,505
Total assets excluding discontinued operations | 469,520 |  |  |  | 384,099 |  |  |  | 469,520 | 384,099 | 580,255
Capital expenditures |  |  |  |  |  |  |  |  | 23,518 | 22,077 | 12,187
Reportable Segments Total |  |  |  |  |  |  |  |  |  |  |
Sales and other financial information by reportable segment |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers |  |  |  |  |  |  |  |  | 2,803,602 | 2,629,879 | 2,417,183
Gross margin |  |  |  |  |  |  |  |  | 834,223 | 728,427 | 797,088
Total assets excluding discontinued operations | 3,332,258 |  |  |  | 3,345,827 |  |  |  | 3,332,258 | 3,345,827 | 3,683,266
Capital expenditures |  |  |  |  |  |  |  |  | 412,537 | 264,790 | 226,769
Other |  |  |  |  |  |  |  |  |  |  |
Sales and other financial information by reportable segment |  |  |  |  |  |  |  |  |  |  |
Total assets excluding discontinued operations | 900,843 |  |  |  | 896,951 |  |  |  | 900,843 | 896,951 | 928,476
Capital expenditures |  |  |  |  |  |  |  |  | $ 16,914 | $ 7,395 | $ 4,838

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