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Fair Value Measurements - Recurring Basis (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair value of assets and liabilities measured on recurring basis      
Other-than-temporary impairment of available-for-sale securities $ 0 $ 0  
Proceeds from the sales and maturities of available-for-sale securities $ 336,000 274,000 $ 346,000
Marketable securities, available-for-sale | Minimum      
Fair value of assets and liabilities measured on recurring basis      
Debt securities maturity period 1 year    
Marketable securities, available-for-sale | Maximum      
Fair value of assets and liabilities measured on recurring basis      
Debt securities maturity period 3 years    
Fair Value, Measurements, Recurring      
Fair value of assets and liabilities measured on recurring basis      
Cash and cash equivalents $ 19,161 14,419  
Marketable securities, current 87,763 80,706  
Deferred compensation trusts 60,003 94,893  
Marketable securities, noncurrent 220,634 343,644  
Fair Value, Measurements, Recurring | Money market funds      
Fair value of assets and liabilities measured on recurring basis      
Available-for-sale securities 19,000 14,000  
Fair Value, Measurements, Recurring | U.S. agency securities      
Fair value of assets and liabilities measured on recurring basis      
Available-for-sale securities 18,000 73,000  
Fair Value, Measurements, Recurring | U.S. Treasury securities      
Fair value of assets and liabilities measured on recurring basis      
Available-for-sale securities 102,000 107,000  
Fair Value, Measurements, Recurring | Corporate debt securities      
Fair value of assets and liabilities measured on recurring basis      
Available-for-sale securities 189,000 245,000  
Fair Value, Measurements, Recurring | Commodity contracts      
Fair value of assets and liabilities measured on recurring basis      
Derivative assets 341 561  
Derivative liabilities 2,510 2,290  
Fair Value, Measurements, Recurring | Foreign currency contracts      
Fair value of assets and liabilities measured on recurring basis      
Derivative assets 8,439 180  
Derivative liabilities 14,138 4,392  
Fair Value, Measurements, Recurring | Level 1      
Fair value of assets and liabilities measured on recurring basis      
Cash and cash equivalents 19,161 14,419  
Deferred compensation trusts 60,003 94,893  
Fair Value, Measurements, Recurring | Level 2      
Fair value of assets and liabilities measured on recurring basis      
Marketable securities, current 87,763 80,706  
Marketable securities, noncurrent 220,634 343,644  
Fair Value, Measurements, Recurring | Level 2 | Commodity contracts      
Fair value of assets and liabilities measured on recurring basis      
Derivative assets 341 561  
Derivative liabilities 2,510 2,290  
Fair Value, Measurements, Recurring | Level 2 | Foreign currency contracts      
Fair value of assets and liabilities measured on recurring basis      
Derivative assets 8,439 180  
Derivative liabilities $ 14,138 $ 4,392