Equity Method Investments Equity Method Investments 2 (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Condensed Combined Summary Financial Information
Revenues	$ 656,665	$ 716,597
Revenues less cost of revenue	291,864	323,932
Net income	$ 63,811	$ 94,660