Stock-Based Compensation Stock Plans (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Class of Stock [Line Items]
Common Stock, Shares Authorized	10,000,000
Shares available for future issuance	29,051,380
Stock-based compensation	$ 104,117,000	$ 93,590,000	$ 36,168,000
Share-based Compensation, amount capitalized	9,700,000	1,500,000
Unrecognized compensation cost, value	$ 221,400,000
Unrecognized compensation cost, period for recognition	1 year 6 months 30 days
2008 Plan [Member]
Class of Stock [Line Items]
Common Stock, Shares Authorized	64,618,500
2010 Plan [Member]
Class of Stock [Line Items]
Common Stock, Shares Authorized	20,000,000
2011 Plan [Member]
Class of Stock [Line Items]
Common Stock, Shares Authorized	50,000,000