Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Narrative) (Details)

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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Income Taxes    
Gross unrecognized tax benefits $ 18,895 $ 18,312
Unrecognized tax benefits, exclusive of interest and penalties, recorded as a non-current liability 4,871 4,626
Unrecognized tax benefits that would impact effective tax rate, if recognized 10,827  
Potential interest and penalties related to unrecognized tax benefits included in income tax expense 548 890
Accrued interest and penalties on unrecognized tax benefits $ 6,566 $ 6,018