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Note 9 - Stock-based Compensation (Details Textual) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017 | Jan. 31, 2019
Share-based Payment Arrangement, Expense | $ 4,000,000 | $ 3,400,000 |  |
Share-based Payment Arrangement, Expense, Tax Benefit | $ 1,000,000 | $ 700,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 0 | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance | 0 |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 263,574 | 274,990 |  |
Performance-based Restricted Stock Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 57,870 |  |  |
The 2019 Long-term Incentive Compensation Program [Member] |  |  |  |
PRSU Awards, Percentage of Target Award, Below Threshold-level Performance |  |  |  | 0.00%
PRSU Awards, Percentage of Target Award, Threshold-level Performance |  |  |  | 50.00%
PRSU Awards, Percentage of Target Award, Target-Level Performance |  |  |  | 100.00%
PRSU Awards, Percentage of Target Award, Maximum-Level Performance |  |  |  | 150.00%
Omnibus Plan 2014 [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 11,700,000 |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition | 3 years 219 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | $ 6,100,000 | $ 6,700,000 |  |
Phantom Stock Plan [Member] | Phantom Share Units (PSUs) [Member] |  |  |  |
Share-based Payment Arrangement, Expense | 100,000 | (37,000) |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | $ 22,000 | $ 1,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period | 1 year |  |  |

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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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