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Income Taxes (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Foreign derived intangible income deduction benefit provided by the Tax Act $ 1,315 $ 1,206  
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
Transition tax, noncurrent 803    
Unrecognized tax benefit, including interest and penalties 17,318    
Unrecognized tax benefits that would affect effective tax rate 15,194    
Amount of uncertain tax liability expected to be paid within one year 4,896    
Amount of uncertain tax liability included in Other long-term liabilities 12,422    
Unrecognized tax benefits related to lapse of statute of limitations, previously unrecognized 3,435    
Liabilities for tax-related interest and penalties 1,962 $ 1,289 $ 1,175
Settlement and Lapse of Statute      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Unrecognized tax benefits expected to be recognized within the next 12 months $ 4,896