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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income [Line Items]      
Accumulated other comprehensive loss, balance at the beginning of the period $ (216,280)    
Other comprehensive income (loss), net of tax 106,213 $ (69,554) $ (68,021)
Accumulated other comprehensive loss, balance at the end of the period (110,067) (216,280)  
Currency Translation Adjustment      
Accumulated Other Comprehensive Income [Line Items]      
Accumulated other comprehensive loss, balance at the beginning of the period (170,566)    
Other comprehensive income (loss), net of tax 101,148    
Accumulated other comprehensive loss, balance at the end of the period (69,418) (170,566)  
Unrealized Gain (Loss) on Retirement Plans      
Accumulated Other Comprehensive Income [Line Items]      
Accumulated other comprehensive loss, balance at the beginning of the period (43,894)    
Other comprehensive income (loss), net of tax 6,791    
Accumulated other comprehensive loss, balance at the end of the period (37,103) (43,894)  
Unrealized Gain (Loss) on Investments      
Accumulated Other Comprehensive Income [Line Items]      
Accumulated other comprehensive loss, balance at the beginning of the period (1,820)    
Other comprehensive income (loss), net of tax (1,726)    
Accumulated other comprehensive loss, balance at the end of the period $ (3,546) $ (1,820)