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Income Taxes (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]          
Foreign derived intangible income deduction benefit provided by the Tax Act   $ 1,206      
Foreign withholding tax included in Deferred income taxes $ 3,199 312 $ 3,199    
Tax benefit from remeasurement of estimated net deferred tax liability     27,153    
Tax expense (benefit) from preliminary estimate of one-time transition tax and withholding tax     14,743    
Net tax benefit from enactment of the Tax Act $ 12,410        
Net tax benefit from enactment of the Tax Act, per diluted share $ 0.08        
One-time transition tax on repatriation of previously deferred foreign earnings   10,711      
Payment of transition tax   1,000      
Overpayment of federal taxes against the transition tax payable   8,908      
Transition tax, noncurrent   803      
Unrecognized tax benefit, excluding interest and penalties $ 14,480 14,367 14,480 $ 17,287 $ 14,517
Unrecognized tax benefits that would affect effective tax rate   13,774      
Amount of previously unrecognized tax benefits recognized   2,621      
Liabilities for tax-related interest and penalties   1,289 $ 1,175 $ 1,227  
Current liabilities          
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]          
Amount of uncertain tax liability expected to be paid within one year   3,131      
Other long-term liabilities          
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]          
Amount of uncertain tax liability included in Other long-term liabilities   12,525      
Settlement and Lapse of Statute          
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]          
Unrecognized tax benefits within the next 12 months   $ 3,131