Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Classes of Financial Assets and Financial Liabilities Measured and Recorded at Fair Value on Recurring Basis (Details)

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Fair Value Measurements - Classes of Financial Assets and Financial Liabilities Measured and Recorded at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Oct. 01, 2016
Cash equivalents:      
Money market funds $ 405,045 $ 840,842  
Time deposits 8,307 14,774  
Derivative financial instruments 26,658 103,340 $ 75,497
Investment securities 202,721 196,738  
Financial liabilities:      
Derivative financial instruments 89,212 25,574 $ 32,181
Deferred compensation 233,151 232,214  
Level 1      
Cash equivalents:      
Money market funds 405,045 840,842  
Time deposits 8,307 14,774  
Investment securities 189,744 179,673  
Level 2      
Cash equivalents:      
Derivative financial instruments 26,658 103,340  
Investment securities 12,977 17,065  
Financial liabilities:      
Derivative financial instruments 89,212 25,574  
Deferred compensation $ 233,151 $ 232,214