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Investments in Unconsolidated Entities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Equity method investments, combined income statements |  |  |  |
Revenues | $ 1,720,964 | $ 1,629,724 | $ 3,450,785 | $ 3,250,114
Operating expenses | 1,276,758 | 1,204,588 | 2,563,479 | 2,334,226
Operating income | 444,206 | 425,136 | 887,306 | 915,888
Other income, net | (10,451) | 640 | (5,623) | 2,403
Net income | $ 433,755 | $ 425,776 | $ 881,683 | $ 918,291

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