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Treasury Stock and Share Based Awards (Tables) | 3 Months Ended
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Mar. 31, 2015
Treasury Stock | Below is a summary of the Company’s treasury stock activity for the three months ended March 31, 2015:
|  | Number of |  |  |  |
|  | Treasury |  |  |  |
|  | Shares |  |  | Cost |
Balance at January 1, 2015 |  |  | 4,057,135 |  |  | $ | 61,807 |
Restricted stock withholdings (1) |  |  | 107,825 |  |  |  | 4,748 |
Restricted stock forfeitures |  |  | 11,737 |  |  |  | — |
Balance at March 31, 2015 |  |  | 4,176,697 |  |  | $ | 66,555 |
(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 $41.21 to $44.67 per share.
Restricted Stock | Below is a summary of restricted stock activity for the three months ended March 31, 2015:
|  | Shares of |  |  | Weighted Average |
|  | Restricted |  |  | Grant Date |
|  | Stock |  |  | Fair Value |
Outstanding at January 1, 2015 |  |  | 878,897 |  |  | $ | 24.92 |
Granted |  |  | 169,862 |  |  | $ | 43.28 |
Vested |  |  | (298,251 | ) |  | $ | 22.97 |
Forfeited |  |  | (11,737 | ) |  | $ | 25.72 |
Outstanding at March 31, 2015 |  |  | 738,771 |  |  | $ | 29.93 |
Unvested restricted stock at March 31, 2015 |  |  | 738,771 |  |  | $ | 29.93 |
Summary of Restricted Stock Award Activity |
|  | Three Months Ended March 31, |
|  | 2015 |  |  | 2014 |
Compensation expense recognized during the period |  | $ | 2,590 |  |  | $ | 2,616 |
Fair value of restricted shares that vested during the period |  | $ | 13,161 |  |  | $ | 17,466 |
Income tax deduction upon vesting of restricted stock awards |  | $ | 3,311 |  |  | $ | 6,645 |
Number of Shares Vested Under Restricted Stock Unit Awards | Below is a table summarizing the potential number of shares that could vest under restricted stock unit awards granted during the three months ended March 31, 2015 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 7.5% |  |  | 45,994 |  |  | $ | 1,991 |
at IRR of at least 9.5% |  |  | 91,988 |  |  | $ | 3,981 |
at IRR of at least 11.5% |  |  | 137,982 |  |  | $ | 5,972 |
Summary of Activity for Restricted Stock Unit Awards |
|  | Three Months Ended March 31, |
|  | 2015 |  |  | 2014 |
Number of restricted stock unit awards that vested during the period |  |  | 123,769 |  |  |  | 392,238 |
Fair value of restricted stock unit awards that vested during the period |  | $ | 5,501 |  |  | $ | 11,194 |
Accumulated dividends paid upon vesting of restricted stock unit awards (1) |  | $ | 46 |  |  | $ | — |
Income tax benefit recognized upon vesting of restricted stock unit awards |  | $ | 2,303 |  |  | $ | 4,751 |
Compensation expense recognized during the period |  | $ | 908 |  |  | $ | 907 |
(1) | Additional dividends of approximately $396 and $1,341 were paid during April 2015 and 2014, respectively.

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 3: http://www.xbrl.org/2003/role/presentationRef -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 4: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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