Investment in Unconsolidated Entities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Schedule of Equity Method Investments
Equity in earnings of unconsolidated entities	$ 34,641	$ 37,327
Equity method investments, combined income statements
Revenues	1,735,340	1,625,765
Operating expenses	1,291,512	1,142,073
Operating income	443,828	483,692
Other income, net	4,470	1,835
Net income	448,298	485,527
Los Angeles SMSA Limited Partnership
Schedule of Equity Method Investments
Equity in earnings of unconsolidated entities	$ 19,900	$ 21,200
Ownership interest in equity method investment	5.50%	5.50%