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Share-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Share-based Payment Arrangement, Option, Activity [Table Text Block] | The following table presents stock options outstanding under these plans (in thousands, except for per share data):
|  | Number |  | Weighted- Average Exercise Price |  | Aggregate Intrinsic Value
Options outstanding at: |  |  |  |  |  |
December 31, 2017 |  | 117,551 |  |  | $ | 53.26 |  |  | $ | 4,592 |
December 31, 2018 |  | 63,058 |  |  | 54.89 |  |  | 1,163 |
December 31, 2019 |  | 36,100 |  |  | 56.75 |  |  | 1,106 |
Options vested at: |  |  |  |  |  |
December 31, 2017 |  | 51,286 |  |  | $ | 48.62 |  |  | $ | 2,241 |
December 31, 2018 |  | 33,573 |  |  | 53.09 |  | 679 |
December 31, 2019 |  | 27,193 |  |  | 57.08 |  | 824 |
Schedule of Nonvested Share Activity [Table Text Block] | The following represents a summary of the non-vested shares for the three years ended December 31, 2019 (in thousands):
|  | Restricted Stock |  | Restricted Stock Units
|  | Shares |  | Weighted Average Grant Date Fair Value |  | Units |  | Weighted Average Grant Date Fair Value
Non-vested at January 1, 2017 |  | 786,706 |  |  |  |  | — |  |  |
Granted |  | 177,807 |  |  | $ | 86.95 |  |  | — |  | — |  | — |
Vested |  | (194,419 | ) |  | 63.07 |  |  | — |  |  | — |
Forfeited |  | (102,991 | ) |  | 78.70 |  |  | — |  |  | — |
Non-vested at December 31, 2017 |  | 667,103 |  |  |  |  | — |  |  |
Granted |  | 150,419 |  |  | $ | 85.58 |  |  | — |  |  | — |
Vested |  | (242,215 | ) |  | 74.85 |  |  | — |  |  | — |
Forfeited |  | (47,700 | ) |  | 75.68 |  |  | — |  |  | — |
Non-vested at December 31, 2018 |  | 527,607 |  |  |  |  | — |  |  |
Granted |  | 145,724 |  |  | $ | 76.74 |  |  | 46,689 |  |  | $ | 87.40 |
Vested |  | (114,201 | ) |  | 61.28 |  |  | — |  |  | — |
Forfeited |  | (131,952 | ) |  | 83.69 |  |  | — |  |  | — |
Non-vested at December 31, 2019 |  | 427,178 |  |  |  |  | 46,689 |  |  |

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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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