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Treasury Stock and Share Based Awards (Tables) | 6 Months Ended
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Jun. 30, 2019
Summary of Treasury Stock Activity | Below is a summary of the Company’s treasury stock activity for the six months ended June 30, 2019:
|  | Number of |  |  |  |  |
|  | Treasury |  |  |  |  |
|  | Shares |  |  | Cost |
Balance at January 1, 2019 |  |  | 4,626,191 |  |  | $ | 79,259 |
Restricted stock withholdings (1) |  |  | 57,456 |  |  |  | 2,247 |
Restricted stock forfeitures |  |  | 14,664 |  |  |  | — |
Balance at June 30, 2019 |  |  | 4,698,311 |  |  | $ | 81,506 |
(1) | The Company withheld restricted shares as a result of the election by certain employees to satisfy their tax liabilities upon vesting in restricted stock and restricted stock units. The Company determined the number of shares to be withheld based upon market values ranging from $36.81 to $40.32 per share.
Summary of Restricted Stock Activity | Below is a summary of restricted stock activity for the six months ended June 30, 2019:
|  | Shares of |  |  | Weighted Average |
|  | Restricted |  |  | Grant Date |
|  | Stock |  |  | Fair Value |
Outstanding at January 1, 2019 |  |  | 704,353 |  |  | $ | 38.68 |
Granted |  |  | 305,287 |  |  | $ | 37.41 |
Vested |  |  | (198,711 | ) |  | $ | 41.38 |
Forfeited |  |  | (14,664 | ) |  | $ | 37.31 |
Outstanding at June 30, 2019 |  |  | 796,265 |  |  | $ | 37.55 |
Unvested restricted stock at June 30, 2019 |  |  | 796,265 |  |  | $ | 37.55 |
Summary of Restricted Stock Unit Award Activity | Below is a table summarizing the potential number of shares that could vest under restricted stock unit awards granted during the six months ended June 30, 2019 at each of the three target levels of financial performance (excluding forfeiture assumptions):
|  | Number of |  |  |  |  |
|  | Shares |  |  | Value at |
|  | Vesting |  |  | Grant |
at IRR of at least 6% |  |  | 136,285 |  |  | $ | 5,011 |
at IRR of at least 8% |  |  | 204,427 |  |  | $ | 7,517 |
at IRR of at least 14% |  |  | 306,651 |  |  | $ | 11,276 |
Restricted Stock |
Summary of Restricted Stock Award Activity |
|  | Six Months Ended June 30, |
|  | 2019 |  |  | 2018 |
Compensation expense recognized during the period |  | $ | 4,869 |  |  | $ | 4,798 |
Fair value of restricted shares that vested during the period |  | $ | 7,630 |  |  | $ | 7,815 |
Income tax benefit recognized upon vesting of restricted stock awards |  | $ | 1,473 |  |  | $ | 1,751 |
Restricted Stock Units (RSUs) |
Summary of Restricted Stock Unit Award Activity |
|  | Six Months Ended June 30, |
|  | 2019 |  |  | 2018 |
Number of restricted stock unit awards that vested during the period |  |  | 88,074 |  |  |  | 127,084 |
Fair value of restricted stock unit awards that vested during the period |  | $ | 3,550 |  |  | $ | 4,846 |
Accumulated dividends paid upon vesting of restricted stock unit awards |  | $ | 375 |  |  | $ | 501 |
Compensation expense recognized during the period |  | $ | 1,777 |  |  | $ | 2,080 |
Income tax benefit recognized upon vesting of restricted stock unit awards |  | $ | 170 |  |  | $ | 740 |

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- Definition Tabular disclosure of treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23309-112656 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 + Details
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