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Note 20 - Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Shares |  |  | Weighted-Average Exercise Price Per Share |  |  | Aggregate Intrinsic V alue (in millions) |
Options outstanding, January 1, 2015 |  |  | 11,893,761 |  |  | $ | 30.23 |  |  | $ | 29.8 |
Exercised |  |  | (1,019,240 | ) |  | $ | 18.36 |  |  | $ | 7.4 |
Forfeited |  |  | (1,862,080 | ) |  | $ | 32.55 |  |  |  |  |
Options outstanding, December 31, 2015 |  |  | 9,012,441 |  |  | $ | 31.09 |  |  | $ | 27.4 |
Exercised |  |  | (1,167,819 | ) |  | $ | 18.03 |  |  | $ | 12.4 |
Forfeited |  |  | (1,830,893 | ) |  | $ | 39.69 |  |  |  |  |
Options outstanding, December 31, 2016 |  |  | 6,013,729 |  |  | $ | 32.09 |  |  | $ | 12.1 |
Exercised |  |  | (83,863 | ) |  | $ | 18.20 |  |  | $ | 3.4 |
Forfeited |  |  | (2,464,920 | ) |  | $ | 35.91 |  |  |  |  |
Options outstanding, December 31, 201 7 |  |  | 3,464,946 |  |  | $ | 27.81 |  |  | $ | - |
Options exercisable (fully vested) - |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2015 |  |  | 7,617,882 |  |  | $ | 32.90 |  |  | $ | 20.0 |
December 31, 2016 |  |  | 5,144,416 |  |  | $ | 32.56 |  |  | $ | 11.3 |
December 31, 201 7 |  |  | 3,464,946 |  |  | $ | 27.81 |  |  | $ | 4.0 |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
|  | 201 7 |  |  | 201 6 |  |  | 201 5 |
Restricted stock outstanding as of January 1, |  |  | 1,930,732 |  |  |  | 1,712,534 |  |  |  | 1,911,145 |
Granted (1) |  |  | 646,142 |  |  |  | 756,530 |  |  |  | 729,160 |
Vested |  |  | (783,872 | ) |  |  | (520,539 | ) |  |  | (875,202 | )
Forfeited |  |  | (15,573 | ) |  |  | (17,793 | ) |  |  | (52,569 | )
Restricted stock outstanding as of December 31, |  |  | 1,777,429 |  |  |  | 1,930,732 |  |  |  | 1,712,534 |
(1) The weighted-average grant date fair value for restricted stock issued during the years ended December 31, 2017, 2016 and 2015 were $25.04, $26.15 and $25.98, respectively. Restricted shares have the same voting rights as the Company ’s common stock and are entitled to a cash dividend per share equal to the Company’s common dividend which is taxable as ordinary income to the holder. For the years ended December 31, 2017, 2016 and 2015, the dividends paid on unvested restricted shares were $2.4 million, $2.2 million, and $1.8 million, respectively.
Share-based Compensation, Performance Shares Award Outstanding Activity [Table Text Block] |
| 2017 |  | 2016 |  | 2015
Performance share award outstanding as of January 1, | 197,249 |  | 202,754 |  | 114,268
Granted (1) | 135,780 |  | 100,170 |  | 145,620
Vested (2) | (97,079) |  | (105,675) |  | (57,134)
Performance share award outstanding as of December 31, | 235,950 |  | 197,249 |  | 202,754
Performance Shares [Member] |
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 201 7 |  |  | 201 6 |  |  | 201 5 |
Stock price |  | $ | 24.91 |  |  | $ | 26.29 |  |  | $ | 26.83 |
Dividend yield (1) |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Risk-free rate |  |  | 1.45 | % |  |  | 0.87 | % |  |  | 0.98 | %
Volatility (2) |  |  | 18.93 | % |  |  | 18.80 | % |  |  | 16.81 | %
Term of the award (years) |  |  | 2.88 |  |  |  | 2.88 |  |  |  | 1.88, 2.88 |

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