Income Taxes (Tax Return Reported Federal Net Operating Losses and Tax Credits) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Research Tax Credit [Member]
Operating Loss Carryforwards [Line Items]
Tax credit	$ 9,081
Tax credit carryforwards, expiration date	Dec. 31, 2033
Alternative Minimum Tax [Member]
Operating Loss Carryforwards [Line Items]
Tax credit	94
Federal [Member]
Operating Loss Carryforwards [Line Items]
Net operating losses	335,892
Net operating losses carried forward, expiration date	Dec. 31, 2033
Foreign [Member]
Operating Loss Carryforwards [Line Items]
Net operating losses	$ 29,115