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Income Taxes, Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of change in liability for unrecognized tax benefits [Roll Forward]    
Balance at beginning of year $ 6,026 $ 6,276
Increases for tax positions taken in the current year 750 834
Increases for tax positions taken in prior years 199 271
Decreases related to settlements with tax authorities (341) (177)
Decreases as a result of lapse of the applicable statutes of limitations (591) (920)
Foreign currency exchange rate changes (11) (258)
Balance at the end of year 6,032 6,026
Income tax uncertainties [Abstract]    
Unrecognized tax benefits that would impact the effective tax rate, if recognized 4,900  
Income tax interest and penalties accrued 600 $ 500
Expected decrease in liability for unrecognized tax benefits in the next fiscal year 600  
Unrecognized tax benefits that would impact the effective tax rate in the next fiscal year 600  
Undistributed earnings 580,000  
Withholding of tax liability $ 24,700