Stock-Based Compensation Plans (Stock-Based Compensation Expense By Statement Of Operations) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock-based employee compensation expense related to employee stock options and emolyee stock purchases, pre tax	$ 15,003,000	$ 9,437,000	$ 7,548,000
Research and Development
Stock-based employee compensation expense related to employee stock options and emolyee stock purchases, pre tax	5,657,000	4,107,000	3,343,000
General and Administrative
Stock-based employee compensation expense related to employee stock options and emolyee stock purchases, pre tax	$ 9,346,000	$ 5,330,000	$ 4,205,000