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Note 15 - Share-Based and Other Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of outstanding awards and compensation expense recognized for each type of share-based award | The following table summarizes awards outstanding and compensation expense recognized for each type of share-based award as of and for the years ended:
|  | December 31,
($ in thousands) |  | 2015 |  | 2014 |  | 2013
Share-Based Compensation Programs |  | Liability Recorded/ Equity Instruments Outstanding |  | Compensation Cost Recognized (1) |  | Liability Recorded/ Equity Instruments Outstanding |  | Compensation Cost Recognized (1) |  | Liability Recorded/ Equity Instruments Outstanding |  | Compensation Cost Recognized (1)
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
RSUs—Cash-Settled |  | $ | 3,595 |  |  | $ | 10,244 |  |  | $ | 65,157 |  |  | $ | 31,834 |  |  | $ | 104,114 |  |  | $ | 79,322 |
SARs—Cash-Settled |  | — |  |  | 159 |  |  | 595 |  |  | 915 |  |  | 8,195 |  |  | 8,544 |
Liabilities |  | $ | 3,595 |  |  | 10,403 |  |  | $ | 65,752 |  |  | 32,749 |  |  | $ | 112,309 |  |  | 87,866 |
Equity: |  |  |  |  |  |  |  |  |  |  |  |
Stock Options |  | 2,692,457 |  |  | 2,984 |  |  | 3,029,348 |  |  | 2,531 |  |  | 3,989,641 |  |  | 2,488 |
Phantom Stock |  | 230,196 |  |  | 2 |  |  | 284,645 |  |  | 3 |  |  | 284,645 |  |  | 3 |
RSUs—Equity Settled |  | 2,472,861 |  |  | 9,243 |  |  | 2,056,596 |  |  | 7,461 |  |  | 1,273,556 |  |  | 4,336 |
Restricted Stock |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 21 |
ESPP |  |  |  | 396 |  |  |  |  | 267 |  |  |  |  | 267 |
Equity |  |  |  | 12,625 |  |  |  |  | 10,262 |  |  |  |  | 7,115 |
Total all share-based plans |  |  |  | $ | 23,028 |  |  |  |  | $ | 43,011 |  |  |  |  | $ | 94,981 |
______________
(1) | For purposes of calculating compensation cost recognized, we generally consider time-vested awards effectively vested (and we recognize the full compensation costs) when grantees become retirement eligible. However, under the terms of our stock option awards granted in 2015, 2014, and 2013, legal vesting for retirement occurs when the grantee actually separates from service, with the exception of certain senior executives for whom vesting remains dependent on the stock price hurdle being met regardless of when the executive separates from service. Performance-based RSU awards granted in 2015, 2014, and 2013 provide that vesting remains dependent on the Company’s performance for the full term of the awards notwithstanding the grantee’s earlier retirement.
Schedule of additional information regarding all share-based awards | The following table reflects additional information regarding all share-based awards for the years indicated:
| Year Ended December 31,
($ in thousands except per-share amounts) | 2015 |  | 2014 |  | 2013
Total compensation cost recognized | $ | 23,028 |  |  | $ | 43,011 |  |  | $ | 94,981 |
Less: Costs deferred as acquisition costs | 500 |  |  | 1,047 |  |  | 1,769 |
Stock-based compensation expense | $ | 22,528 |  |  | $ | 41,964 |  |  | $ | 93,212 |
Schedule of information with regard to stock options | Information with regard to stock options for the periods indicated is as follows:
| Number of Shares |  | Weighted Average Exercise Price Per Share
Outstanding, December 31, 2014 | 3,029,348 |  |  | $ | 5.46 |
Granted | 212,230 |  |  | 18.42 |
Exercised | (496,496 | ) |  | 2.59 |
Forfeited | (52,625 | ) |  | 8.89 |
Expired | — |  |  | — |
Outstanding, December 31, 2015 | 2,692,457 |  |  | 6.94 |
Exercisable, December 31, 2015 | 1,435,232 |  |  | 4.44 |
Available for grant, December 31, 2015 | 2,803,988 |  |  |
Schedule of fully vested share options | The table below summarizes information regarding fully vested stock options as of December 31, 2015:
($ in millions, except share and per share amounts) | Outstanding and Exercisable
Number of options vested | 1,435,232 |
Fair value of options vested during the year | $ | 3.4 |
Weighted-average exercise price per share | $ | 4.44 |
Aggregate intrinsic value (excess market price over exercise price) | $ | 12.9 |
Weighted-average remaining contractual term of options (in years) | 4.1 years |
Schedule of outstanding and exercisable options | The following table summarizes information concerning outstanding and exercisable options at December 31, 2015:
| 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 | 1,718,010 |  |  | 5.2 |  | $ | 2.80 |  |  | 1,153,515 |  |  | $ | 2.98 |
$5.76 - $7.06 | 47,967 |  |  | 2.2 |  | 6.92 |  |  | 47,967 |  |  | 6.92 |
$10.42 - $15.44 | 718,790 |  |  | 6.1 |  | 13.53 |  |  | 225,580 |  |  | 10.91 |
$18.42 | 207,690 |  |  | 3.0 |  | 18.42 |  |  | 8,170 |  |  | 18.42 |
| 2,692,457 |  |  | 4.3 |  |  |  | 1,435,232 |  |  |
Schedule of valuation assumptions of stock options granted | We use the Monte Carlo valuation model in determining the grant date fair value of stock options issued to executives and non-executives using the assumptions noted in the following table:
| Year Ended December 31,
| 2015 |  | 2014 |  | 2013
Derived service period (years) | 3.02 - 4.00 |  |  | 2.99 - 3.96 |  |  | 3.02 - 4.00 |
Risk-free interest rate (1) | 2.32 | % |  | 2.57 | % |  | 1.96 | %
Volatility (2) | 93.70 | % |  | 94.26 | % |  | 94.63 | %
Dividend yield | 0.05 | % |  | 0.07 | % |  | 0.07 | %
______________
(1) | The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant.
(2) | Volatility is determined at the date of grant using historical share price volatility and expected life of each award.
Schedule of valuation assumptions of performance based RSU | The following are assumptions used in our calculation of the grant date fair value of performance-based RSUs to be settled in common stock:
| 2015 |  | 2014 |  | 2013
Expected life | 3 years |  |  | 3 years |  |  | 3 years |
Risk-free interest rate | 1.0 | % |  | 1.0 | % |  | 0.4 | %
Volatility | 40.6 | % |  | 71.9 | % |  | 81.8 | %
Dividend yield | 0.05 | % |  | 0.06 | % |  | 0.07 | %
Schedule of changes in RSU to be settled under 2008 Equity Plan | Information with regard to RSUs to be settled in stock for the periods indicated is as follows:
| Number of Shares |  | Weighted Average Grant Date Fair Value
Unvested, December 31, 2014 | 2,056,596 |  |  | $ | 10.65 |
Granted | 612,881 |  |  | 18.26 |
Vested | (121,989 | ) |  | 5.83 |
Forfeited | (74,627 | ) |  | 15.55 |
Unvested, December 31, 2015 | 2,472,861 |  |  | 12.62 |
Schedule of valuation assumptions of ESPP | The following are assumptions used in our calculation of ESPP compensation expense during 2015:
| January 1, 2015 |  | July 1, 2015
Expected life | 6 months |  |  | 6 months |
Risk-free interest rate | 0.36 | % |  | 0.44 | %
Volatility | 35.03 | % |  | 26.83 | %
Dividend yield | 0.03 | % |  | 0.03 | %

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + Details
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