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Restructuring Charges (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Changes to accrued liability balance related to restructuring charges |  |
Beginning balance | $ 1,776 |
Additions for costs expensed | 6,636 | 11,594
Less non-cash expenses | (83) | (1,575)
Reductions for payments | (8,329) | (8,243)
Ending balance |  | 1,776
Restructuring charges by segment |  |
Costs incurred | 6,636 | 11,594
Total costs incurred | 18,230 |
North America contract operations |  |
Restructuring charges by segment |  |
Costs incurred | 968 | 53
Total costs incurred | 1,021 |
International contract operations |  |
Restructuring charges by segment |  |
Costs incurred | 800 | 502
Total costs incurred | 1,302 |
Aftermarket services |  |
Restructuring charges by segment |  |
Costs incurred | 485 | 422
Total costs incurred | 907 |
Fabrication |  |
Restructuring charges by segment |  |
Costs incurred | 902 | 1,574
Total costs incurred | 2,476 |
Other |  |
Restructuring charges by segment |  |
Costs incurred | 3,481 | 9,043
Total costs incurred | $ 12,524 |

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