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Note 17 - Compensation Plans (Details Textual) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2019 | Apr. 01, 2018 | Mar. 31, 2018 | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares
Share-based Payment Arrangement, Expense |  |  |  | $ 47,600,000 | $ 42,700,000 | $ 38,500,000
Number of Service Hours |  |  |  | 1,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  | 4 years |  |
Profit Sharing Contributions |  |  |  | $ 0 | 0 | 0
Share-based Payment Arrangement, Expense, Tax Benefit |  |  |  | 42,900,000 | 23,200,000 | 48,900,000
Proceeds from Stock Options Exercised |  |  |  | $ 88,000,000.0 | $ 52,400,000 | 87,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year) |  |  |  | 6 years | 5 years 9 months 18 days |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (Year) |  |  |  | 4 years 8 months 12 days | 4 years 7 months 6 days |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation |  |  |  | $ 4,100,000 | $ 5,500,000 | $ 3,700,000
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) | shares |  |  |  | 27,890 | 40,578 | 35,637
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount |  |  |  | $ 82,400,000 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  | 2 years 3 months 18 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value |  |  |  | $ 20,100,000 | $ 17,400,000 | $ 16,800,000
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date |  |  |  | 5.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate |  |  |  | 20.00% |  |
Share Based Compensation Arrangement By Share Based Payment Award, Percentage Of Short Term Incentive Compensation Available For Payroll Deductions Maximum |  |  |  | 50.00% |  |
Share Based Compensation Arrangement By Share Based Payment Award, Payroll Deductions Amount Maximum |  |  |  | $ 25,000.0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares |  |  |  | $ 25.87 | $ 24.13 | $ 21.48
The 2013 Incentive Plan [Member] |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | shares |  |  |  | 3,104,938 |  |
ESPP [Member] |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | shares |  |  |  | 1,260,266 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares) | shares |  |  |  | 32,502 | 30,705 | 30,550
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares |  |  |  | $ 164.44 | $ 141.17 | $ 104.71
Minimum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Target Levels |  |  |  | 0.00% |  |
Maximum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Target Levels |  |  |  | 200.00% |  |
Common Class A [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) | shares |  |  |  | 15,700,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Basis to Reduce for Shares Issued Subject to Option or Stock Appreciation Rights |  |  |  | 1 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized, Basis to Reduce for Shares Issued Subject to Awards Other Than Options or Stock Appreciation Rights |  |  |  | 2.5 |  |
KSOP [Member] |  |  |  |  |  |
Maximum Pre Tax Employee Contribution To Saving Plan |  |  |  | $ 19,500 | $ 19,000.0 | $ 18,500
Share-based Compensation Arrangement by Share-based Payment Award, Additional Employee Contribution, Minimum Participant Age (Year) |  |  |  | 50 years |  |
Additional Pre Tax Certain Eligible Employee Contribution To Saving Plan |  |  |  | $ 6,500 | 6,000.0 | 6,000.0
Maximum Employee Contribution As Percentage Of Compensation | 6.00% |  |  | 10.00% |  |
Percentage Of Employer Contribution | 100.00% | 87.50% | 75.00% |  |  |
Employee Contribution, Percentage of Compensation |  | 6.00% | 6.00% |  |  |
Share-based Payment Arrangement, Expense |  |  |  | $ 31,600,000 | 31,000,000.0 | 22,000,000.0
Number of Service Hours |  |  |  | 1,000 |  |
Restricted Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  | 4 years |  |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation |  |  |  | $ 4,100,000 | $ 5,500,000 |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) | shares |  |  |  | 27,890 | 40,578 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  |  |  | $ 22,300,000 | $ 20,200,000 | 18,600,000
Performance Shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  |  |  | $ 8,200,000 | $ 4,200,000 | $ 1,500,000
Employee Stock Purchase Plan [Member] | UK Sharesave Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  | 3 years |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | shares |  |  |  | 454,178 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date |  |  |  | 5.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares) | shares |  |  |  | 8,174 | 18,713 | 19,247
Value of Common Stock Issued to Employees Per Share (in dollars per share) | $ / shares |  |  |  | $ 159.98 | $ 136.35 | $ 101.27

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Discount rate from fair value on purchase date that participants pay for shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of shares issued under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement. + References No definition available. + Details
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- Definition This element represents the maximum percentage of compensation eligible participants could make to a 401(k) plan account during the reporting period. + References No definition available. + Details
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- Definition Represents number of shares authorized basis to reduce for shares issued subjected to awards other than options for stock appreciation right for share-based compensation arrangement by share-based payment award. + References No definition available. + Details
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