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Note 15 - Share-Based and Other Compensation Programs (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Compensation Cost Recognized | The following table summarizes the compensation cost recognized and additional information regarding all share-based awards for the years indicated:
| Year Ended December 31,
(In thousands) | 2019 |  | 2018 |  | 2017
Compensation cost recognized (1): |  |  |  |  |
RSUs | $ | 20,694 |  |  | $ | 16,591 |  |  | $ | 12,207 |
Non-Qualified Stock Options | 274 |  |  | 603 |  |  | 851 |
Phantom Stock | 2 |  |  | 2 |  |  | 2 |
Employee Stock Purchase Plan | 444 |  |  | 453 |  |  | 432 |
Total compensation cost recognized | 21,414 |  |  | 17,649 |  |  | 13,492 |
Less: Costs deferred as acquisition costs | 373 |  |  | 324 |  |  | 269 |
Stock-based compensation expense | $ | 21,041 |  |  | $ | 17,325 |  |  | $ | 13,223 |
______________________ (1) Compensation cost is generally recognized over the periods that an employee provides service in exchange for the award. For purposes of calculating compensation cost recognized, we generally consider awards effectively vested (and we recognize the full compensation costs) when grantees become retirement eligible.
Schedule of RSUs Equity-Settled | Information with regard to RSUs to be settled in stock for the periods indicated is as follows:
| Performance-Based |  | Time-Vested
| Number of Shares |  | Weighted-Average Grant Date Fair Value |  | Number of Shares |  | Weighted-Average Grant Date Fair Value
Unvested, December 31, 2018 (1) | 2,692,949 |  |  | $ | 14.32 |  |  | 704,062 |  |  | $ | 16.51 |
Granted (2) | 656,854 |  |  | $ | 21.45 |  |  | 380,568 |  |  | $ | 22.76 |
Performance adjustment (3) | 400,757 |  |  | $ | — |  |  | — |  |  | $ | — |
Vested (4) | (1,246,824 | ) |  | $ | 8.43 |  |  | (368,325 | ) |  | $ | 16.81 |
Forfeited | (55,389 | ) |  | $ | 17.81 |  |  | (18,729 | ) |  | $ | 18.31 |
Unvested, December 31, 2019 (1) | 2,448,347 |  |  | $ | 17.03 |  |  | 697,576 |  |  | $ | 19.72 |
______________________
(1) | The final amount of RSUs distributed depends on the level of performance achieved along with each employee’s continued service through the vest date, which could result in changes in vested RSUs.
(2) | For performance-based RSUs, amount represents the probable outcome at grant date.
(3) | Represents an adjustment to the number of unvested performance-based RSUs due to changes during the period in our estimated payouts, which can range from 0 to 200% of target depending on results over the applicable performance periods.
(4) Represents amounts vested during the year, which can include both original shares granted and the impact of performance adjustments.
Schedule of Information with regard to Stock Options | Information with regard to stock options for the periods indicated is as follows:
($ in thousands, except per-share amounts) | Number of Shares |  | Weighted Average Exercise Price Per Share |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value (1)
Outstanding, December 31, 2018 | 1,312,791 |  |  | $ | 9.39 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | (329,900 | ) |  | 7.41 |  |  |  |  |
Forfeited | (1,344 | ) |  | 12.25 |  |  |  |  |
Expired | — |  |  | — |  |  |  |  |
Outstanding, December 31, 2019 | 981,547 |  |  | 10.05 |  |  | 4.0 |  | $ | 14,833 |
Exercisable, December 31, 2019 | 853,041 |  |  | $ | 9.73 |  |  | 3.7 |  | $ | 13,163 |
Available for grant, December 31, 2019 | 6,266,017 |  |  |  |  |  |  |
______________________ (1) Based on the market price of $25.16 at December 31, 2019.
Schedule of Information of Exercised Stock Options | The following table summarizes additional information concerning stock option activity for the periods indicated:
| Years Ended December 31,
($ in thousands, except per-share amounts) | 2019 |  | 2018 |  | 2017
Aggregate intrinsic value of options exercised | $ | 4,984 |  |  | $ | 6,274 |  |  | $ | 14,389 |
Tax benefit of options exercised | 1,047 |  |  | 1,318 |  |  | 5,036 |
Cash received from options exercised | 2,416 |  |  | 1,425 |  |  | 7,131 |
Schedule of Outstanding and Exercisable Stock Options | The following table summarizes information concerning outstanding and exercisable options at December 31, 2019:
| Options Outstanding |  | Options Exercisable
Range of Exercise Prices | Number Outstanding |  | Weighted Average Remaining Contractual Life (Years) |  | Weighted Average Exercise Price |  | Number Exercisable |  | Weighted Average Exercise Price
$2.45 - $3.58 | 377,117 |  |  | 2.4 |  | $ | 2.45 |  |  | 377,117 |  |  | $ | 2.45 |
$10.42 - $15.44 | 449,976 |  |  | 4.9 |  | $ | 13.54 |  |  | 321,470 |  |  | $ | 14.09 |
$18.42 | 154,454 |  |  | 5.3 |  | $ | 18.42 |  |  | 154,454 |  |  | $ | 18.42 |
| 981,547 |  |  | 4.0 |  | $ | 10.05 |  |  | 853,041 |  |  | $ | 9.73 |
Schedule of Valuation Assumptions of ESPP | The following assumptions were used in our calculation of Employee Stock Purchase Plan compensation expense during 2019:
| January 1, 2019 |  | July 1, 2019
Expected life | 6 months |  |  | 6 months |
Risk-free interest rate | 2.76 | % |  | 2.18 | %
Volatility | 36.24 | % |  | 27.90 | %
Dividend yield | 0.06 | % |  | 0.04 | %

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + 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=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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