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Note 17 - Share-Based Compensation and Other Benefit Programs - RSUs (Details) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) anniversary $ / shares shares | Dec. 31, 2019 USD ($) anniversary $ / shares shares | Dec. 31, 2018 USD ($) anniversary $ / shares
Performance-based RSUs (Equity settled) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Unvested, Beginning of Period, Number of Shares | shares | 2,375,005 |  |
Unvested, Beginning of Period, Weighted Average Grant-Date Fair Value Per Share | $ 15.84 |  |
Granted, Number of Shares | shares | 839,330 |  |
Granted, Weighted Average Grant-Date Fair Value Per Share | $ 11.91 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Performance Adjustment to Shares | shares | 168,749 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Performance Adjustment to Shares, Weighted Average Grant Date Fair Value | $ 0 |  |
Vested, Number of Shares | shares | (1,174,535) |  |
Vested, Weighted Average Grant-Date Fair Value Per Share | $ 13.14 |  |
Forfeited, Number of Shares | shares | (22,305) |  |
Forfeited, Weighted Average Grant-Date Fair Value Per Share | $ 18.69 |  |
Unvested, End of Period, Number of Shares | shares | 2,186,244 | 2,375,005 |
Unvested, End of Period, Weighted Average Grant-Date Fair Value Per Share | $ 15.71 | $ 15.84 |
Grants by Compensation Committee | shares | 839,330 |  |
Performance-based RSUs (Equity settled) | 2020 Award Year |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Fair Value of RSUs Vested | $ | $ 17.2 |  |
Award Requisite Service Period | 3 years |  |
Maximum Payout Percentage of Target Award | 200.00% |  |
Performance-based RSUs (Equity settled) | 2019 Award Year |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Granted, Weighted Average Grant-Date Fair Value Per Share |  | $ 21.45 |
Fair Value of RSUs Vested | $ |  | $ 10.6 |
Award Requisite Service Period |  | 3 years |
Maximum Payout Percentage of Target Award |  | 200.00% |
Performance-based RSUs (Equity settled) | 2018 Award Year |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Granted, Weighted Average Grant-Date Fair Value Per Share |  |  | $ 15.07
Fair Value of RSUs Vested | $ |  |  | $ 0.2
Award Requisite Service Period |  |  | 3 years
Maximum Payout Percentage of Target Award |  |  | 200.00%
Timed-vested RSUs (Equity settled) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Unvested, Beginning of Period, Number of Shares | shares | 1,869,740 |  |
Unvested, Beginning of Period, Weighted Average Grant-Date Fair Value Per Share | $ 13.82 |  |
Granted, Number of Shares | shares | 763,608 |  |
Granted, Weighted Average Grant-Date Fair Value Per Share | $ 13.49 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Performance Adjustment to Shares | shares | 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Performance Adjustment to Shares, Weighted Average Grant Date Fair Value | $ 0 |  |
Vested, Number of Shares | shares | (501,283) |  |
Vested, Weighted Average Grant-Date Fair Value Per Share | $ 15.98 |  |
Forfeited, Number of Shares | shares | (13,180) |  |
Forfeited, Weighted Average Grant-Date Fair Value Per Share | $ 17.61 |  |
Unvested, End of Period, Number of Shares | shares | 2,118,885 | 1,869,740 |
Unvested, End of Period, Weighted Average Grant-Date Fair Value Per Share | $ 13.16 | $ 13.82 |
Grants by Compensation Committee | shares | 763,608 |  |
Timed-vested RSUs (Equity settled) | 2020 Award Year |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Fair Value of RSUs Vested | $ | $ 7.6 |  |
Number of Anniversaries of the Grant Date | anniversary | 3 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |  |
Timed-vested RSUs (Equity settled) | 2019 Award Year |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Granted, Weighted Average Grant-Date Fair Value Per Share |  | $ 22.76 |
Fair Value of RSUs Vested | $ |  | $ 10.9 |
Number of Anniversaries of the Grant Date | anniversary |  | 3 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 3 years |
Timed-vested RSUs (Equity settled) | 2018 Award Year |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Granted, Weighted Average Grant-Date Fair Value Per Share |  |  | $ 16.24
Fair Value of RSUs Vested | $ |  |  | $ 4.2
Number of Anniversaries of the Grant Date | anniversary |  |  | 3
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 3 years
Minimum | Performance-based RSUs (Equity settled) | 2020 Award Year |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Maximum Payout Percentage of Target Award | 0.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Post-Vesting Holding Period | 1 year |  |
Minimum | Performance-based RSUs (Equity settled) | 2019 Award Year |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Post-Vesting Holding Period |  | 1 year |
Minimum | Performance-based RSUs (Equity settled) | 2018 Award Year |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Post-Vesting Holding Period |  |  | 1 year
Minimum | Timed-vested RSUs (Equity settled) | 2020 Award Year |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 1 year |  |
Minimum | Timed-vested RSUs (Equity settled) | 2019 Award Year |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 1 year |
Minimum | Timed-vested RSUs (Equity settled) | 2018 Award Year |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 1 year

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- Definition The number of anniversaries of the grant date upon which RSUs will vest in pro rata installments. + References No definition available. + Details
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- Definition The maximum payout percentage at the end of the performance period based on the target award. + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Performance Adjustment to Shares, Weighted Average Grant Date Fair Value + References No definition available. + Details
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- Definition The holding period after the vesting of performance RSUs that were granted to executive officers after which the vested awards will be convertible into shares. + References No definition available. + Details
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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=120381028&loc=d3e5070-113901 + Details
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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 The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=120381028&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=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(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 weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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