Stockholders' Equity and Employee Stock Option Plans 1997 Stock Plan (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Apr. 01, 2013	Mar. 31, 2013	Dec. 31, 2010
1997 Stock Plan [Abstract]
Common Stock, Capital Shares Reserved for Future Issuance	10,123,801			10,905,404	20,972,838
Options and SARS, Outstanding, Number	4,104,849	3,939,315	3,103,472		5,505,404	4,275,648
Share-based Compensation Arrangement by Share-based Payment Award, Additional Shares Authorized in 2013 Amendment				5,400,000
Number of Additional Shares Authorized	7,122,039	1,700,859	1,679,692
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	4,650,855	13,467,582	13,047,736		15,467,434	11,420,522