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Fair Value of Financial Instruments - Recurring Basis (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair value of assets and liabilities measured on recurring basis      
Other-than-temporary impairment of available-for-sale securities $ 0 $ 0  
Proceeds from sale and maturity of available-for-sale securities      
Proceeds from the sales and maturities of available-for-sale securities $ 159,000 286,000 $ 336,000
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 $ 1,301 21,035  
Marketable securities, current 57,783 54,840  
Deferred compensation trusts 23,256 37,510  
Marketable securities, noncurrent 113,622 143,553  
Fair Value, Measurements, Recurring | Money market funds      
Fair value of assets and liabilities measured on recurring basis      
Available-for-sale Securities 1,000 21,000  
Fair Value, Measurements, Recurring | U.S. agency securities      
Fair value of assets and liabilities measured on recurring basis      
Available-for-sale Securities 3,000 11,000  
Fair Value, Measurements, Recurring | U.S. Treasury securities      
Fair value of assets and liabilities measured on recurring basis      
Available-for-sale Securities 69,000 87,000  
Fair Value, Measurements, Recurring | Corporate debt securities      
Fair value of assets and liabilities measured on recurring basis      
Available-for-sale Securities 97,000 100,000  
Fair Value, Measurements, Recurring | Commercial paper      
Fair value of assets and liabilities measured on recurring basis      
Available-for-sale Securities 3,000    
Fair Value, Measurements, Recurring | Commodity contracts      
Fair value of assets and liabilities measured on recurring basis      
Derivative assets   83  
Derivative liabilities   129  
Fair Value, Measurements, Recurring | Foreign currency contracts      
Fair value of assets and liabilities measured on recurring basis      
Derivative assets 29,766 34,776  
Derivative liabilities 29,127 43,574  
Fair Value, Measurements, Recurring | Level 1      
Fair value of assets and liabilities measured on recurring basis      
Cash and cash equivalents 701 21,035  
Deferred compensation trusts 23,256 37,510  
Fair Value, Measurements, Recurring | Level 2      
Fair value of assets and liabilities measured on recurring basis      
Cash and cash equivalents 600    
Marketable securities, current 57,783 54,840  
Marketable securities, noncurrent 113,622 143,553  
Fair Value, Measurements, Recurring | Level 2 | Commodity contracts      
Fair value of assets and liabilities measured on recurring basis      
Derivative assets   83  
Derivative liabilities   129  
Fair Value, Measurements, Recurring | Level 2 | Foreign currency contracts      
Fair value of assets and liabilities measured on recurring basis      
Derivative assets 29,766 34,776  
Derivative liabilities $ 29,127 $ 43,574