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Note 6 - Share-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Years ended December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Restricted share units |  |  |  |  |  |  |  |  |  |  |  |
Pretax compensation expense |  | $ | 29,938 |  |  | $ | 27,898 |  |  | $ | 27,256 |
Tax benefit |  |  | 11,347 |  |  |  | 10,629 |  |  |  | 10,360 |
Restricted share units, net of tax |  | $ | 18,591 |  |  | $ | 17,269 |  |  | $ | 16,896 |
Performance share units |  |  |  |  |  |  |  |  |  |  |  |
Pretax compensation expense |  | $ | 10,687 |  |  | $ | 9,330 |  |  | $ | 7,882 |
Tax benefit |  |  | 4,050 |  |  |  | 3,555 |  |  |  | 2,996 |
Performance share awards, net of tax |  | $ | 6,637 |  |  | $ | 5,775 |  |  | $ | 4,886 |
Stock options |  |  |  |  |  |  |  |  |  |  |  |
Pretax compensation expense |  | $ | - |  |  | $ | - |  |  | $ | 195 |
Tax benefit |  |  | - |  |  |  | - |  |  |  | 74 |
Stock option expense, net of tax |  | $ | - |  |  | $ | - |  |  | $ | 121 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
Restricted Share Units |  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Unvested at December 31, 2013 |  |  | 2,421,430 |  |  | $ | 41.49 |
Granted |  |  | 447,780 |  |  |  | 75.61 |
Vested |  |  | (808,914 | ) |  |  | 37.33 |
Forfeited |  |  | (119,298 | ) |  |  | 47.81 |
Unvested at December 31, 2014 |  |  | 1,940,998 |  |  | $ | 51.74 |
Granted |  |  | 390,143 |  |  |  | 74.86 |
Vested |  |  | (783,483 | ) |  |  | 39.45 |
Forfeited |  |  | (30,908 | ) |  |  | 54.89 |
Unvested at December 31, 2015 |  |  | 1,516,750 |  |  | $ | 63.96 |
Granted |  |  | 540,746 |  |  |  | 75.03 |
Vested |  |  | (520,619 | ) |  |  | 54.78 |
Forfeited |  |  | (34,221 | ) |  |  | 69.14 |
Unvested at December 31, 2016 |  |  | 1,502,656 |  |  | $ | 71.16 |
Schedule of Nonvested Performance-based Units Activity [Table Text Block] |
Performance Share Units |  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Unvested at December 31, 2013 |  |  | 408,025 |  |  | $ | 56.78 |
Granted |  |  | 106,945 |  |  |  | 76.22 |
Vested |  |  | (81,075 | ) |  |  | 53.26 |
Forfeited |  |  | - |  |  |  | - |
Unvested at December 31, 2014 |  |  | 433,895 |  |  | $ | 62.23 |
Granted |  |  | 160,574 |  |  |  | 74.37 |
Vested |  |  | (103,796 | ) |  |  | 58.28 |
Forfeited |  |  | - |  |  |  | - |
Unvested at December 31, 2015 |  |  | 490,673 |  |  | $ | 67.04 |
Granted |  |  | 142,114 |  |  |  | 74.71 |
Vested |  |  | (148,733 | ) |  |  | 62.84 |
Forfeited |  |  | - |  |  |  | - |
Unvested at December 31, 2016 |  |  | 484,054 |  |  | $ | 70.58 |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
Stock Options |  | Number of Shares (in thousands) |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value (in millions) |
Outstanding at December 31, 2013 |  |  | 440 |  |  | $ | 19.08 |  |  |  | 1.67 |  |  | $ | 25.6 |
Exercised |  |  | (341 | ) |  |  | 18.70 |  |  |  | - |  |  |  | 19.9 |
Forfeited |  |  | (1 | ) |  |  | 19.08 |  |  |  | - |  |  |  | - |
Outstanding at December 31, 2014 |  |  | 98 |  |  | $ | 20.40 |  |  |  | 0.86 |  |  | $ | 6.3 |
Exercised |  |  | (95 | ) |  |  | 20.35 |  |  |  | - |  |  |  | 5.8 |
Forfeited |  |  | (1 | ) |  |  | 24.27 |  |  |  | - |  |  |  | - |
Outstanding at December 31, 2015 |  |  | 2 |  |  | $ | 20.76 |  |  |  | 0.05 |  |  | $ | 0.1 |
Exercised |  |  | (2 | ) |  |  | 20.76 |  |  |  | - |  |  |  | - |
Forfeited |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Outstanding at December 31, 2016 |  |  | - |  |  | $ | - |  |  |  | - |  |  | $ | - |
Exercisable |  |  | - |  |  | $ | - |  |  |  | - |  |  | $ | - |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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