Income Taxes (Narrative of Other Carryforwards) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Capital Loss | U.S. Federal
Tax Credit Carryforward, Description	Capital loss carryforwards
Tax Credit Carryforward, Amount	$ 10.7
Tax Credit Carryforward, Expiration Date	Dec. 31, 2015
Capital Loss | New Jersey
Tax Credit Carryforward, Description	Capital loss carryforwards
Tax Credit Carryforward, Amount	15.3
Tax Credit Carryforward, Expiration Date	Dec. 31, 2015
Research Credit | U.S. Federal
Tax Credit Carryforward, Description	Research Tax Credit
Tax Credit Carryforward, Amount	$ 82.6
Tax Credit Carryforward, Expiration Date	Jan. 01, 2030