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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
Dec. 31, 2014
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]            
Statutory rate     35.00% 35.00% 35.00%  
Estimated liability for the one-time transition tax under the Tax Act $ 11,544   $ 11,544      
Estimated liability for the one-time transition tax under the Tax Act, short term 915   915      
Estimated liability for the one-time transition tax under the Tax Act, long term 10,629   10,629      
Foreign withholding tax included in Deferred income taxes 3,199   3,199 $ 0    
Tax benefit from adjustment of estimated deferred tax liability     27,153      
Tax expense 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          
Unrecognized tax benefit, excluding interest and penalties $ 14,480   14,480 17,287 $ 14,517 $ 14,018
Unrecognized tax benefits that would affect effective tax rate 13,737   13,737      
Amount of previously unrecognized tax benefits recognized     5,846      
Liabilities for tax-related interest and penalties     1,175 $ 1,227 $ 1,391  
Current liabilities [Member]            
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]            
Amount of uncertain tax liability expected to be paid within one year 3,275   3,275      
Other long-term liabilities [Member]            
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]            
Amount of uncertain tax liability included in Other long-term liabilities 12,380   12,380      
Settlement and Lapse of Statute [Member]            
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]            
Unrecognized tax benefits within the next 12 months $ 3,275   $ 3,275      
Subsequent Event [Member]            
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]            
Statutory rate   21.00%