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Fair Value of Financial Instruments - Financial Instruments Not Required to be Measured at Fair Value (Details)
$ in Thousands, € in Millions
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 31, 2016
Nov. 30, 2014
Sep. 30, 2011
Revolving Credit Facility            
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis            
Maximum borrowing capacity | € € 125          
1.750% Senior Notes            
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis            
Interest rate (as a percent) 1.75% 1.75% 1.75% 1.75%    
3.375% Senior Notes            
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis            
Interest rate (as a percent) 3.375% 3.375% 3.375%     3.375%
3.5% Senior Notes            
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis            
Interest rate (as a percent) 3.50% 3.50% 3.50%   3.50%  
Carrying Value            
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis            
Marketable securities, current   $ 103,351 $ 56,197      
Notes receivable, including noncurrent portion   26,006 29,458      
Carrying Value | Revolving Credit Facility            
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis            
Debt     52,735      
Carrying Value | 1.750% Senior Notes            
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis            
Debt   597,674 523,629      
Carrying Value | 3.375% Senior Notes            
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis            
Debt   496,859 496,011      
Carrying Value | 3.5% Senior Notes            
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis            
Debt   493,320 492,360      
Carrying Value | Notes payable, including noncurrent portion            
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis            
Debt   31,106 35,457      
Fair Value | Level 2            
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis            
Marketable securities, current   103,351 56,197      
Fair Value | Level 2 | Revolving Credit Facility            
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis            
Debt     52,735      
Fair Value | Level 2 | 1.750% Senior Notes            
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis            
Debt   622,277 551,582      
Fair Value | Level 2 | 3.375% Senior Notes            
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis            
Debt   512,475 512,510      
Fair Value | Level 2 | 3.5% Senior Notes            
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis            
Debt   513,480 508,230      
Fair Value | Level 2 | Notes payable, including noncurrent portion            
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis            
Debt   31,106 35,457      
Fair Value | Level 3            
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis            
Notes receivable, including noncurrent portion   26,006 29,458      
Bank deposits | Carrying Value            
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis            
Cash and cash equivalents   1,104,316 1,133,295      
Bank deposits | Fair Value | Level 1            
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis            
Cash and cash equivalents   1,104,316 1,133,295      
Time deposits | Carrying Value            
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis            
Cash and cash equivalents   698,458 696,106      
Time deposits | Fair Value | Level 2            
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis            
Cash and cash equivalents   $ 698,458 $ 696,106