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Noncontrolling Interests (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Noncontrolling Interests |  |  |  |  |
Revenues | $ 445,013 | $ 337,436 | $ 855,008 | $ 629,009 |
Net income attributable to noncontrolling interests | 329 | 124 | 599 | 168 |
Tax effect on income recognized | 9,990 | 7,346 | 16,197 | 13,910 |
Accounts receivable | 251,092 |  | 251,092 |  | 268,095
Current liabilities | 381,100 |  | 381,100 |  | 420,669
Blythe joint venture | Primary beneficiary |  |  |  |  |
Noncontrolling Interests |  |  |  |  |
Revenues | 15,631 | 3,793 | 31,903 | 5,414 |
Net income attributable to noncontrolling interests | 329 | 124 | 599 | 168 |
Tax effect on income recognized |  |  | 0 | 0 |
Distributions to noncontrolling interests |  |  | 0 | 0 |
Capital contributions made by noncontrolling interests |  |  | 0 | 0 |
Cash | 4,442 |  | 4,442 |  | 3,565
Accounts receivable | 11,464 |  | 11,464 |  | 8,843
Current liabilities | $ 11,680 |  | $ 11,680 |  | $ 9,379

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