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Note 6 - Debt (Details Textual) $ in Thousands, € in Millions, ¥ in Millions |  |  |  | 12 Months Ended | 25 Months Ended | 30 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 16, 2018 USD ($) | Oct. 13, 2017 USD ($) | Mar. 04, 2016 USD ($) | Dec. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 02, 2016 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2020 USD ($) | Nov. 15, 2017 USD ($) | Oct. 12, 2017 USD ($) | Feb. 15, 2017 USD ($) | Dec. 08, 2016 USD ($) | Dec. 08, 2016 EUR (€) | Dec. 27, 2014 USD ($) | Dec. 27, 2014 CNY (¥)
Payments of Debt Issuance Costs |  |  |  | $ 1,626 | $ 3,583 | $ 42 |  |  |  |  |  |  |  |  |
Interest Paid |  |  |  | 13,400 | $ 8,600 | $ 4,100 |  |  |  |  |  |  |  |  |
Bank of America [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of Debt Issuance Costs |  |  |  | $ 2,600 |  |  |  |  |  |  |  |  |  |  |
Euro Senior Notes, Series A and B [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | € |  |  |  |  |  |  |  |  |  |  |  |  | € 212 |  |
Euro Senior Notes, Series A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  | $ 117,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  | 1.14% | 1.14% |  |
Euro Senior Notes, Series B [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | € |  |  |  |  |  |  |  |  |  |  |  |  | € 95 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  | 1.83% | 1.83% |  |
U.S. Senior Notes, Series A and B [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  | $ 125,000 |  |  |
U.S. Senior Notes, Series A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | $ 25,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  | 3.03% |  |  |  |
U.S. Senior Notes, Series B [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  | 3.74% |  |  |  |
US Senior Notes A and B Due 2025 and 2030 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | $ 175,000 |  |  |  |  |  |
Entrustment Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.25% | 5.25%
Entrusted Loan |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17,900 | ¥ 110
Subsequent Event [Member] | US Senior Notes A Due 2025 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.48% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | US Senior Notes B Due 2030 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 125,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.78% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Debt Agreement, Maximum Borrowing Capacity |  |  | $ 700,000 |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Additional Uncommitted Borrowing Capacity |  | $ 300,000 | 150,000 |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Additional Uncommitted Borrowing Capacity, Minimum Increments |  |  | $ 25,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of Advances |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  | 3.07% |  |  |  |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  | $ 100 |  |  |  |  |  |  |  |  |  |  |
Credit Agreement [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  | 0.15% |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement [Member] | Base Rate [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement [Member] | Base Rate [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 700,000 | $ 575,000 |  |  |  |  |  |  | $ 575,000 |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  | $ 699,900 |  |  |  |  |  |  |  |  |  |  |
Credit Agreement [Member] | Term Loan Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 200,000 | $ 125,000 |  |  |  |  |  |  | $ 125,000 |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  | $ 125,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Quarterly Payments, Percentage of Loan |  |  |  | 1.25% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment |  |  |  | $ 1,600 |  |  |  |  |  |  |  |  |  |  |
Credit Agreement [Member] | Term Loan Credit Facility [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt | $ 75,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment | $ 2,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement [Member] | Term Loan Credit Facility [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Periodic Payment, Principal |  |  |  |  |  |  | $ 1,600 | $ 3,100 |  |  |  |  |  |  |
Bank of America [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of Debt Issuance Costs |  |  |  | $ 1,600 |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of cash paid for interest. Includes, but is not limited to, payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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