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, 2012
Dec. 31, 2011
Dec. 31, 2010
Change in enacted foreign statutory tax rates $ 1,025    
Net change in valuation allowance 894 3,000 67,364
Decrease in valuation allowance for deferred income taxes 1,300 3,000 65,000
Increase in valuation allowance 406 [1]    
Write off of expiring NOL     2,364
Net operating loss carryforwards for U.S. federal income tax purposes   214,195  
Tax windfall   1,853  
Research and experimentation credit carryforwards   1,640  
Alternative minimum tax credit carryforwards   291  
AMT percentage   20.00%  
Maximum percentage of income offset by available NOLs   90.00%  
Net operating loss carryforwards, net of limitations   $ 212,342  
Minimum [Member]
     
Foreign statutory tax rate, foreign operations 19.00%    
Maximum [Member]
     
Foreign statutory tax rate, foreign operations 33.00%    
[1] Increase in valuation allowance due to the acquisition of certain deferred tax assets where the more likely than not criteria was not met.