Annual report pursuant to Section 13 and 15(d)

Income Taxes (Narrative) (Details)

v3.7.0.1
Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Line Items]        
Gross deferred tax asset $ 75,416 $ 72,859    
Valuation allowance 67,662 64,486 $ 15,628 $ 16,651
Net deferred tax asset 7,754 8,373    
Deferred tax liabilities, gross 16,720 17,342    
Net change in valuation allowance 3,176 48,858 (1,023)  
Change in valuation allowance for deferred income taxes (3,176) (48,858) (161)  
Increase in valuation allowance     (1,184)  
Net operating loss carryforwards for U.S. federal income tax purposes 172,419      
Tax windfall 270      
Research and experimentation credit carryforwards 3,407      
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 $ 172,149      
Unrecognized tax benefits that would impact effective tax rate 1,135 322    
Unrecognized tax benefits that reduce deferred tax assets 327 230    
Tax expected to be reversed 738      
Interest expected to be reversed 181      
Tax reserve accrued 397      
Interest expense accrued 4      
Interest and penalty expense recognized 183 2 $ 0  
Total accrued interest and penalties $ 185 $ 2    
Minimum [Member]        
Income Tax Disclosure [Line Items]        
Foreign statutory tax rate, foreign operations 25.00%