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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 |

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- Definition Period of time to maturity of debt security which is intended be sold or mature more than one year from the balance sheet date or operating cycle, if longer, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Fair value portion of assets held under deferred compensation agreements. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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- Definition Total of debt securities categorized neither as held-to-maturity nor trading which are intended be sold or mature more than one year from the balance sheet date or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=82896770&loc=SL6284422-111562 + Details
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