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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Nonvested Performance Shares and Restricted Stock | A summary of the status of nonvested restricted stock as of second quarter-end 2019 and year-to-date changes is presented as follows below (in thousands of shares except per share data).
| Shares |  | Weighted Average Grant Date Fair Value
Nonvested at year-end 2018 | 356 |  |  | $ | 23.44 |
Granted | 179 |  |  | 24.77 |
Vested | (101 | ) |  | 22.70 |
Forfeited | (30 | ) |  | 23.72 |
Nonvested at second quarter-end 2019 | 404 |  |  | $ | 24.20 |
A summary of the status of all nonvested performance shares at target as of second quarter-end 2019 and year-to-date changes is presented as follows below (in thousands of shares except per share data). The majority of the vested shares below is related to the 2016 performance share grant, which cliff-vested after approval from the Compensation Committee during the first quarter of 2019.
| Financial Measure Performance Shares |  | TSR Performance Shares
| Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value
Nonvested at year-end 2018 | 481 |  |  | $ | 23.58 |  |  | 173 |  |  | $ | 23.56 |
Granted | 250 |  |  | 25.38 |  |  | — |  |  | — |
Vested | (188 | ) |  | 28.05 |  |  | (55 | ) |  | 19.73 |
Forfeited | — |  |  | — |  |  | — |  |  | — |
Nonvested at second quarter-end 2019 | 543 |  |  | $ | 25.08 |  |  | 118 |  |  | $ | 25.35 |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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