Investment in Unconsolidated Entities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Equity and cost method investments
Investments in unconsolidated entities	$ 201,171	$ 191,644	$ 179,921
Equity in earnings of unconsolidated entities	27,089	23,389
Equity method investments, combined income statements
Revenues	1,498,260	1,437,008
Operating expenses	1,071,692	1,076,750
Operating income	426,568	360,258
Other income, net	423	649
Net income	426,991	360,907
Los Angeles SMSA Limited Partnership
Equity and cost method investments
Equity in earnings of unconsolidated entities	$ 20,600	$ 17,100
Ownership interest in equity method investment	5.50%	5.50%