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Income Taxes - Tax Effects of Temporary Differences That Give Rise to Significant Portions of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred tax liabilities:      
Property, plant and equipment $ 981 $ 1,139  
Goodwill 25,149 22,655  
Other intangible assets 9,397 11,801  
Other 5,703 4,139  
Total deferred tax liabilities recognized 41,230 39,734  
Deferred tax assets:      
Operating loss and tax credits carry-forwards 29,995 24,962  
Property, plant and equipment 4,893 4,062  
Accrued expenses and payments on account 24,599 24,433  
Stock compensation 6,490 5,786  
Deferred compensation 2,197 2,548  
Deferred revenue 5,681 0  
Other 2 740  
Total deferred tax assets 73,857 62,531  
Valuation allowance for deferred tax assets (27,263) (22,439) $ (20,300)
Deferred tax assets recognized 46,594 40,092  
Overall net deferred tax asset $ 5,364 $ 358