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Equity Method Investments (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 WesPac item | Dec. 31, 2011 WesPac item | Jul. 01, 2010 WesPac | Jul. 01, 2010 WesPac Kealine | Dec. 31, 2012 Bernard | Dec. 31, 2011 Bernard | Dec. 31, 2009 Bernard | Dec. 31, 2012 Alvah, Inc. | Nov. 17, 2012 Alvah, Inc. | Dec. 31, 2012 Alvah, Inc. ARB | Dec. 31, 2012 Alvah, Inc. Q3C
Equity method investments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Membership interest (as a percent) |  |  |  |  |  | 50.00% | 50.00% |  |  | 30.00% |  | 49.00% |  |
Balance sheet data |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  | $ 16,896 | $ 20,147 |  |  | $ 592 | $ 5,677 |  |  |  |  |
Liabilities |  |  |  | 1,063 | 1,820 |  |  | 86 | 4,771 |  |  |  |  |
Net assets |  |  |  | 15,833 | 18,327 |  |  | 506 | 906 |  |  |  |  |
Company's equity investment | 12,813 | 12,687 |  | 11,463 | 12,415 |  |  | 150 | 272 |  |  |  |  |
Earnings data: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 552 | 1,717 |  |  | 4,026 | 72,822 |  |  |  |  |
Expenses |  |  |  | 2,455 | 9,303 |  |  | 227 | 39,650 |  |  |  |  |
Earnings before taxes |  |  |  | (1,903) | (7,586) |  |  | 3,799 | 33,172 |  |  |  |  |
Company's equity in earnings | 186 | 4,018 | 4,630 | (952) | (3,793) |  |  | 1,138 | 9,415 |  |  |  |  |
Number of potential projects terminated by major oil refining third party |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Amount expensed |  |  |  | 1,100 | 5,400 |  |  |  |  |  |  |  |  |
Number of projects abandoned |  |  |  | 3 |  |  |  |  |  |  |  |  |  |
Share of expenses recorded by the entity (as a percent) |  |  |  | 50.00% | 50.00% |  |  |  |  |  |  |  |  |
Reduction recorded to recognize an estimate for an other than temporary decrease |  |  |  |  | 1,700 |  |  |  |  |  |  |  |  |
Basis difference between the entity's original investment and its pro-rata share of the investee equity prior to any impairment adjustment |  |  |  |  | 5,000 |  |  |  |  |  |  |  |  |
Amount distributed |  |  |  |  |  |  |  | 4,200 | 36,955 |  | 200 |  |  |
Share in distribution | 1,358 | 10,136 | 9,491 |  |  |  |  | 1,260 | 10,022 |  | 98 |  |  |
Subcontractor payments made to equity method investee |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,377 | $ 537

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