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Investments in Unconsolidated Entities (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Equity method investments, combined income statements |  |  |  |
Revenues | $ 1,643,734 | $ 1,577,934 | $ 4,861,057 | $ 4,593,690
Operating expenses | 1,225,417 | 1,125,966 | 3,540,783 | 3,256,399
Operating income | 418,317 | 451,968 | 1,320,274 | 1,337,291
Other income, net | 1,651 | 1,063 | 4,077 | 2,773
Net income | $ 419,968 | $ 453,031 | $ 1,324,351 | $ 1,340,064

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