Stockholders' Equity Stockholders' Equity (Stock Option Plans) (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 2011 Stock Plan [Member] Employee Stock Option [Member]	Mar. 31, 2012 2002 Stock Plan [Member] Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future issuance				3,400,000	1,200,000
Total intrinsic value of options exercised	$ 274,200,000	$ 14,700,000	$ 128,100,000
Cash received from option exercised	$ 124,557,000	$ 4,124,000	$ 19,614,000