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Investment in Unconsolidated Entities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Equity method investments, combined income statements
Revenues	$ 1,625,765	$ 1,475,620
Operating expenses	1,142,073	1,038,991
Operating income	483,692	436,629
Other income, net	1,835	510
Net income	$ 485,527	$ 437,139

The amount of gross profit (loss) reported by an equity method investment of the entity.

The amount of net income (loss) reported by an equity method investment of the entity.