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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]        
Undistributed earnings of foreign subsidiaries $ 106,122      
Unrecognized tax benefit, excluding interest and penalties 17,287 $ 14,517 $ 14,018 $ 12,028
Unrecognized tax benefits that would affect effective tax rate 14,868      
Amount of uncertain tax liability included in Other long-term liabilities 14,645 11,397    
Amount of previously unrecognized tax benefits recognized 2,370      
Liabilities for tax-related interest and penalties 1,227 $ 1,391 $ 1,066  
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 3,866      
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 14,645      
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 $ 3,866