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Income Taxes - Unrecognized tax benefit (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of activity related to unrecognized tax benefits, excluding interest and penalties:      
Unrecognized tax benefits at beginning of year $ 11,646 $ 11,049 $ 11,347
Gross additions - current year tax positions 787 801 1,159
Gross additions - acquired tax positions 659 0 0
Gross reductions - prior year tax positions (248) (91) (348)
Gross reductions - Acquired tax positions settled with tax authorities (461) (113) (1,241)
Impact of change in foreign exchange rates   0 132
Impact of change in foreign exchange rates (16)    
Unrecognized tax benefits at end of year 12,367 11,646 11,049
Liability of interest and penalties 3,900 3,300 2,700
Income tax expense 40,600 47,232 48,475
Beam      
Reconciliation of activity related to unrecognized tax benefits, excluding interest and penalties:      
Unrecognized tax benefits, would affect the company's future effective tax rate if recognized next 12 months 5,000 5,000 4,900
Liability of interest and penalties 3,400 3,000 2,700
Income tax expense $ 500 $ 300 $ 200