Income Taxes (Narrative of Carryforwards) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
U.S. Federal
Operating Loss Carryforwards	$ 381.0
Operating loss carryforwards, expiration dates	Dec. 31, 2015
Capital Loss Carryforwards	10.6
Capital Loss Carryforward, Expiration Dates	Begin in 2014
U.S. Federal Research Tax Credit Carryforwards	68.3
U.S. Federal Research Tax Credit Carryforwards, Expiration Dates	Begin in 2030
New Jersey
Operating Loss Carryforwards	369.9
Operating loss carryforwards, expiration dates	Dec. 31, 2013
Capital Loss Carryforwards	$ 18.0
Capital Loss Carryforward, Expiration Dates	Begin in 2013