Annual report pursuant to Section 13 and 15(d)

Income Taxes (Narrative) (Details)

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Income Taxes (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Line Items]      
Change in enacted foreign statutory tax rates   $ 1,025  
Net change in valuation allowance 490 894 3,000
Decrease in valuation allowance for deferred income taxes 490 1,300 3,000
Increase in valuation allowance   406 [1]  
Net operating loss carryforwards for U.S. federal income tax purposes 215,562    
Tax windfall 5,154    
Research and experimentation credit carryforwards 2,270    
Alternative minimum tax credit carryforwards 315    
AMT percentage 20.00%    
Maximum percentage of income offset by available NOLs 90.00%    
Net operating loss carryforwards, net of limitations $ 210,408    
Minimum [Member]
      
Income Tax Disclosure [Line Items]      
Foreign statutory tax rate, foreign operations 19.00%    
Maximum [Member]
      
Income Tax Disclosure [Line Items]      
Foreign statutory tax rate, foreign operations 39.00%    
[1] Increase in valuation allowance due to the acquisition of certain deferred tax assets where the more likely than not criteria was not met.