Annual report pursuant to Section 13 and 15(d)

Income Taxes (Narrative) (Details)

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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Line Items]        
Liability for Uncertain Tax Positions, Noncurrent $ 328      
Gross deferred tax asset 71,288 $ 72,157    
Valuation allowance 62,915 15,628 $ 16,651 $ 17,184
Net deferred tax asset 8,373 56,529    
Deferred tax liabilities, gross 17,342 16,169    
Net change in valuation allowance 47,287 (1,023) (533)  
Change in valuation allowance for deferred income taxes (47,287) (161)    
Increase in valuation allowance   $ (1,184) $ (533)  
Net operating loss carryforwards for U.S. federal income tax purposes 166,206      
Tax windfall 294      
Research and experimentation credit carryforwards 1,408      
Alternative minimum tax credit carryforwards $ 56      
AMT percentage 20.00%      
Maximum percentage of income offset by available NOLs 90.00%      
Net operating loss carryforwards, net of limitations $ 165,912      
Minimum [Member]        
Income Tax Disclosure [Line Items]        
Foreign statutory tax rate, foreign operations 25.00%