Balance Sheet Components (Narrative) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
Contingent consideration	$ 406,200,000	$ 379,200,000
Restricted cash	50,500,000	1,500,000
Other long-term obligations	1,025,064,000	771,111,000
Clean Energy Partnerships
Schedule of Equity Method Investments [Line Items]
Other long-term obligations	304,200,000	78,700,000
Other assets | Clean Energy Partnerships
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 292,200,000	$ 71,700,000