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Noncontrolling Interests (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
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | $ 1,511 |  |
Accounts receivable | 268,095 |  |  |  | 187,378 |  |  |  | 268,095 | 187,378 |
Current liabilities | 420,669 |  |  |  | 345,019 |  |  |  | 420,669 | 345,019 |
Carrying value of assets | 931,207 |  |  |  | 728,413 |  |  |  | 931,207 | 728,413 |
Carrying value of liabilities | 598,569 |  |  |  | 453,481 |  |  |  | 598,569 | 453,481 |
Revenues | 480,883 | 431,842 | 337,436 | 291,573 | 373,066 | 375,483 | 351,956 | 359,645 | 1,541,734 | 1,460,150 | 941,765
Blythe joint venture |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 1,511 |  |
Cash | 3,565 |  |  |  |  |  |  |  | 3,565 |  |
Accounts receivable | 8,843 |  |  |  |  |  |  |  | 8,843 |  |
Current liabilities | 9,379 |  |  |  |  |  |  |  | 9,379 |  |
Carrying value of assets |  |  |  |  | 2,546 |  |  |  |  | 2,546 |
Carrying value of liabilities |  |  |  |  | 2,540 |  |  |  |  | 2,540 |
Blythe joint venture | Primary beneficiary |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 25,769 |  |

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