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Investment 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 $ 1,726,558 $ 1,635,216 $ 3,460,818 $ 3,259,900
Operating expenses 1,281,625 1,209,412 2,572,643 2,343,092
Operating income 444,933 425,804 888,175 916,808
Other income, net (10,873) 378 (6,508) 2,403
Net income $ 434,060 $ 426,182 $ 881,667 $ 919,211