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Income Taxes (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Line Items]          
Valuation allowance $ 6,734,000 $ 4,570,000 $ 6,734,000 $ 4,570,000  
Valuation allowance increase     2,200,000    
Income tax impact associated with stock option exercises     0 0 $ 2,160,000
Net current period other comprehensive income (loss)     (126,000) 394,000 (285,000)
Tax Cuts and Jobs Act of 2017 - provisional income tax expense   48,300,000 6,500,000 17,500,000  
Tax Cuts and Jobs Act of 2017 - provisional income tax expense related to remeasurement of DTA   26,600,000      
Tax Cuts and Jobs Act of 2017 - provisional income tax expense, deemed repatriation of foreign earnings   21,700,000      
Tax Cuts And Jobs Act Of 2017 - provisional income tax expense, adjustment 6,700,000        
Tax Cuts and Jobs Act of 2017, deferred tax liabilities, undistributed foreign earnings, global intangible low-taxed income (GILTI) 400,000   400,000    
Tax Cuts and Jobs Act of 2017, deferred tax assets, undistributed foreign earnings, foreign derived intangible income (FDII) (700,000)   (700,000)    
Tax Cuts and Jobs Act of 2017, deferred tax assets, undistributed foreign earnings, global intangible low-taxed income and foreign derived intangible income (GILTI & FDII) (300,000)   (300,000)    
Possible reduction in liabilities for uncertain tax positions 1,100,000   1,100,000    
Unrecognized tax benefits that would impact effective tax rate 9,600,000   9,600,000    
Unrecognized tax benefits, income tax penalties and interest expense     100,000 (400,000) $ 600,000
Unrecognized tax benefits, income tax penalties and interest accrued 3,400,000 $ 3,300,000 3,400,000 $ 3,300,000  
Foreign Earnings Repatriated     1,000,000    
Total foreign earnings     188,400,000    
US Federal          
Income Tax Disclosure [Line Items]          
Operating loss carryforwards 8,000,000   $ 8,000,000    
Operating loss carryforwards expiration year     2021    
State and Local Jurisdiction          
Income Tax Disclosure [Line Items]          
Tax credit carryforwards $ 1,700,000   $ 1,700,000    
ITALY | Earliest Tax Year          
Income Tax Disclosure [Line Items]          
Income tax examination, year under examination     2004    
ITALY | Latest Tax Year          
Income Tax Disclosure [Line Items]          
Income tax examination, year under examination     2012    
GERMANY | Earliest Tax Year          
Income Tax Disclosure [Line Items]          
Income tax examination, year under examination     2014    
GERMANY | Latest Tax Year          
Income Tax Disclosure [Line Items]          
Income tax examination, year under examination     2016    
UNITED KINGDOM | Earliest Tax Year          
Income Tax Disclosure [Line Items]          
Income tax examination, year under examination     2014    
UNITED KINGDOM | Latest Tax Year          
Income Tax Disclosure [Line Items]          
Income tax examination, year under examination     2016    
FRANCE | Earliest Tax Year          
Income Tax Disclosure [Line Items]          
Income tax examination, year under examination     2015    
FRANCE | Latest Tax Year          
Income Tax Disclosure [Line Items]          
Income tax examination, year under examination     2016