Annual report pursuant to Section 13 and 15(d)

Income Taxes (Unrecognized Tax Benefit) (Details)

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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 unrecognized tax benefit      
Unrecognized tax benefits balance at beginning of year $ 15,628 $ 18,312 $ 16,476
Additions based on tax positions related to the current year 2,261 1,907 1,691
Decrease based on tax positions related to prior years   (3,976)  
Additions based on tax positions related to prior years 1,050   145
Reductions for settlements with taxing authorities 0 (615) 0
Unrecognized tax benefits balance at end of year 18,939 15,628 $ 18,312
Unrecognized tax benefits that would impact effective tax rate, if recognized 18,939    
Decrease in unrecognized tax benefits is possible in next twelve months 6,150    
Accrued interest and penalties on unrecognized tax benefits 7,336 5,977  
Potential interest and penalties related to unrecognized tax benefits included in income tax expense $ 1,476 $ 126