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Share-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Cash Proceeds Received and Tax Benefit from Share-based Payment Awards [Table Text Block] | The below table presents the number of shares withheld, amounts remitted to taxing authorities and the tax benefits associated with these obligations:
|  | For the Year Ended December 31,
|  | 2018 |  | 2017 |  | 2016
(amounts except shares, in thousands) |  |  |  |  |  |
Shares withheld to satisfy tax obligations |  | 10,436 |  |  | 10,269 |  |  | 12,031 |
Amounts remitted to tax authorities to satisfy obligations |  | $ | 1,210 |  |  | $ | 692 |  |  | $ | 770 |
Tax benefit associated with settlement of share based payments |  | $ | — |  |  | $ | 349 |  |  | 285 |
Share-Based Compensation Amounts Included in Net Income | The table below presents the amounts included in net income related to share-based compensation expense for the awards granted under the SICP for the years ended December 31, 2018, 2017 and 2016:
| For the Year Ended December 31,
| 2018 |  | 2017 |  | 2016
(in thousands) |  |  |  |  |
Awards to non-employee directors | $ | 539 |  |  | $ | 540 |  |  | $ | 580 |
Awards to key employees | 2,871 |  |  | 1,950 |  |  | 1,787 |
Total compensation expense | 3,410 |  |  | 2,490 |  |  | 2,367 |
Less: tax benefit | (934 | ) |  | (1,003 | ) |  | (952 | )
Share-based compensation amounts included in net income | $ | 2,476 |  |  | $ | 1,487 |  |  | $ | 1,415 |
SICP Awards to Key Employees |
Summary of Stock Activity Non-employee directors | The table below presents the summary of the stock activity for awards to key employees:
| Number of Shares |  | Weighted Average Fair Value
Outstanding — December 31, 2016 | 115,091 |  |  | $ | 51.85 |
Granted | 52,355 |  |  | $ | 63.42 |
Vested | (32,926 | ) |  | $ | 38.88 |
Expired | (1,878 | ) |  | $ | 39.97 |
Outstanding — December 31, 2017 | 132,642 |  |  | $ | 59.31 |
Granted | 49,494 |  |  | $ | 67.76 |
Vested | (29,786 | ) |  | $ | 47.39 |
Vested - Accelerated pursuant to separation agreement (1) | (16,676 | ) |  | $ | 75.78 |
Expired | (3,933 | ) |  | $ | 49.66 |
Outstanding — December 31, 2018 | 131,741 |  |  | $ | 67.24 |
(1) Includes 2,569 shares that were forfeited

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- Definition Tabular disclosure of cash received from exercise of stock options and similar instruments granted under share-based payment arrangements and tax benefit from exercise of stock options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=SL79508275-113901 + Details
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- Definition Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: 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=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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