Income Taxes (NOL and Tax Credit Carryforward) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Federal
Net Operating Losses and Tax Credit Carryforwards
Net operating losses, amount	$ 184,818
Tax credits, amount	5,138
State
Net Operating Losses and Tax Credit Carryforwards
Net operating losses, amount	148,325
Tax credits, amount	5,459
Foreign
Net Operating Losses and Tax Credit Carryforwards
Net operating losses, amount	15,403
Tax credits, amount	$ 16