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Note 6 - Share-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Years ended December 31, |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Restricted share units |  |  |  |  |  |  |  |  |  |  |  |
Pretax compensation expense |  | $ | 38,632 |  |  | $ | 32,797 |  |  | $ | 28,679 |
Tax benefit |  |  | 9,337 |  |  |  | 7,740 |  |  |  | (4,385 | )
Restricted share units, net of tax |  | $ | 29,295 |  |  | $ | 25,057 |  |  | $ | 33,064 |
Performance share units |  |  |  |  |  |  |  |  |  |  |  |
Pretax compensation expense |  | $ | 14,692 |  |  | $ | 14,572 |  |  | $ | 9,612 |
Tax benefit |  |  | 3,551 |  |  |  | 3,439 |  |  |  | (1,470 | )
Performance share awards, net of tax |  | $ | 11,141 |  |  | $ | 11,133 |  |  | $ | 11,082 |
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, 2016 |  |  | 1,502,656 |  |  | $ | 71.16 |
Granted |  |  | 158,319 |  |  |  | 90.06 |
Vested |  |  | (380,702 | ) |  |  | 67.29 |
Forfeited |  |  | (37,745 | ) |  |  | 75.13 |
Unvested at December 31, 2017 |  |  | 1,242,528 |  |  | $ | 74.71 |
Granted |  |  | 370,669 |  |  |  | 119.82 |
Vested |  |  | (337,512 | ) |  |  | 79.02 |
Forfeited |  |  | (29,850 | ) |  |  | 83.69 |
Unvested at December 31, 2018 |  |  | 1,245,835 |  |  | $ | 86.80 |
Granted |  |  | 440,255 |  |  |  | 99.60 |
Vested |  |  | (341,218 | ) |  |  | 85.61 |
Forfeited |  |  | (31,454 | ) |  |  | 93.91 |
Unvested at December 31, 2019 |  |  | 1,313,418 |  |  | $ | 91.22 |
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, 2016 |  |  | 484,054 |  |  | $ | 70.58 |
Granted |  |  | - |  |  |  | - |
Vested |  |  | (155,867 | ) |  |  | 68.27 |
Forfeited |  |  | - |  |  |  | - |
Unvested at December 31, 2017 |  |  | 328,187 |  |  | $ | 71.68 |
Granted |  |  | 150,763 |  |  |  | 122.57 |
Vested |  |  | (118,438 | ) |  |  | 69.29 |
Forfeited |  |  | - |  |  |  | - |
Unvested at December 31, 2018 |  |  | 360,512 |  |  | $ | 93.74 |
Granted |  |  | 142,156 |  |  |  | 98.58 |
Vested |  |  | (127,140 | ) |  |  | 93.46 |
Forfeited |  |  | - |  |  |  | - |
Unvested at December 31, 2019 |  |  | 375,528 |  |  | $ | 95.67 |

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