Income Taxes (NOL and Tax Credit Carryforward) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Federal [Member]
Net Operating Losses and Tax Credit Carryforwards
Net operating losses, amount	$ 196,941
Tax credits, amount	5,141
State [Member]
Net Operating Losses and Tax Credit Carryforwards
Net operating losses, amount	146,916
Tax credits, amount	5,975
Foreign [Member]
Net Operating Losses and Tax Credit Carryforwards
Net operating losses, amount	3,241
Tax credits, amount	$ 16