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CAPITAL STOCK (Tables) | 12 Months Ended
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Dec. 31, 2017
Summary of Treasury Stock Activity | Below is a summary of the Company’s treasury stock activity for the years ended December 31, 2015, 2016 and 2017.
| Number of Treasury Shares |  |  | Cost |
Balance at December 31, 2014 |  | 4,057,135 |  |  | $ | 61,807 |
Restricted stock forfeitures (1) |  | 17,897 |  |  | — |
Restricted stock withholdings (2) |  | 108,472 |  |  |  | 4,770 |
Balance at December 31, 2015 |  | 4,183,504 |  |  | $ | 66,577 |
Restricted stock forfeitures (1) |  | 56,808 |  |  | — |
Restricted stock withholdings (2) |  | 206,690 |  |  |  | 6,834 |
Balance at December 31, 2016 |  | 4,447,002 |  |  | $ | 73,411 |
Restricted stock forfeitures (1) |  | 10,341 |  |  | — |
Restricted stock withholdings (2) |  | 68,527 |  |  |  | 2,943 |
Balance at December 31, 2017 |  | 4,525,870 |  |  | $ | 76,354 |
(1) | The Company repurchased forfeited and canceled restricted shares at a cost of $0.001 per share in accordance with the Company’s 2017 Omnibus Incentive Plan.
(2) | The Company withheld restricted shares as a result of the election by certain employees to satisfy their tax liabilities upon vesting in restricted stock. The Company determined the number of shares to be withheld based upon market values that ranged from $29.17 to $44.67 per share.
Summary of Restricted Stock Activity | Below is a summary of restricted stock activity for the years ended December 31, 2015, 2016 and 2017:
|  | Year Ended |  |  | Year Ended |  |  | Year Ended |
|  | December 31, 2015 |  |  | December 31, 2016 |  |  | December 31, 2017 |
|  | Shares of Restricted Stock |  |  | Weighted Average Grant Date Fair Value |  |  | Shares of Restricted Stock |  |  | Weighted Average Grant Date Fair Value |  |  | Shares of Restricted Stock |  |  | Weighted Average Grant Date Fair Value |
Outstanding at January 1 |  |  | 878,897 |  |  | $ | 24.92 |  |  |  | 757,775 |  |  | $ | 30.73 |  |  |  | 606,618 |  |  | $ | 33.51 |
Granted |  |  | 226,212 |  |  | $ | 42.79 |  |  |  | 335,707 |  |  | $ | 30.98 |  |  |  | 246,534 |  |  | $ | 41.70 |
Vested |  |  | (329,437 | ) |  | $ | 23.72 |  |  |  | (430,056 | ) |  | $ | 26.60 |  |  |  | (192,230 | ) |  | $ | 36.26 |
Forfeited |  |  | (17,897 | ) |  | $ | 27.58 |  |  |  | (56,808 | ) |  | $ | 33.81 |  |  |  | (10,341 | ) |  | $ | 33.48 |
Outstanding at December 31 |  |  | 757,775 |  |  | $ | 30.73 |  |  |  | 606,618 |  |  | $ | 33.51 |  |  |  | 650,581 |  |  | $ | 35.81 |
Summary of Restricted Stock Unit Financial Performance Thresholds and Vesting Rates | The financial performance factors and respective vesting rates for each of the 2015, 2016 and 2017 grants are as follows:
|  | Year Ended December 31, |  |  | Percentage of Shares Vesting |
|  | 2015 |  |  | 2016 |  |  | 2017 |  |  |  |  |
Threshold IRR |  | 7.5% |  |  | 6.0% |  |  | 7.0% |  |  | 33.3% |
Target IRR |  | 9.5% |  |  | 8.0% |  |  | 9.5% |  |  | 66.6% |
Maximum IRR |  | 11.5% |  |  | 10.0% |  |  | 13.0% |  |  | 100.0% |
Summary of Restricted Stock Unit Award Activity | Below is a table summarizing the potential number of units that could vest under restricted stock unit awards granted during the years ended December 31, 2015, 2016 and 2017 at each of the three levels of financial performance (excluding forfeitures):
|  | Granted During the Year Ended December 31, |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | Number of |  |  | Value at |  |  | Number of |  |  | Value at |  |  | Number of |  |  | Value at |
|  | Units |  |  | Grant(1) |  |  | Units |  |  | Grant(1) |  |  | Units |  |  | Grant(1) |
at threshold IRR |  |  | 47,640 |  |  | $ | 2,057 |  |  |  | 84,554 |  |  | $ | 2,522 |  |  |  | 58,545 |  |  | $ | 2,481 |
at target IRR |  |  | 95,282 |  |  | $ | 4,115 |  |  |  | 169,107 |  |  | $ | 5,044 |  |  |  | 117,089 |  |  | $ | 4,961 |
at maximum IRR |  |  | 142,917 |  |  | $ | 6,173 |  |  |  | 253,661 |  |  | $ | 7,568 |  |  |  | 175,634 |  |  | $ | 7,442 |
(1) | The grant date fair values for units issued during the years ended December 31, 2015, 2016, and 2017 were $43.19, $29.83 and $42.37, respectively.
Restricted Stock |
Summary of Restricted Stock Award Activity | Below is a summary of restricted stock award activity recorded for the periods indicated.
|  | Year Ended December 31, |
|  | 2015 |  |  | 2016 |  |  | 2017 |
Compensation expense recognized during the period |  | $ | 9,600 |  |  | $ | 8,250 |  |  | $ | 8,384 |
Fair value of restricted shares that vested during the period |  | $ | 14,424 |  |  | $ | 14,662 |  |  | $ | 8,172 |
Income tax deduction upon vesting of restricted stock awards |  | $ | 3,823 |  |  | $ | 5,555 |  |  | $ | 2,667 |
Restricted Stock Units (RSUs) |
Summary of Restricted Stock Unit Award Activity | Below is a summary of activity for restricted stock unit awards for the periods indicated:
|  | Year Ended December 31, |
|  | 2015 |  |  | 2016 |  |  | 2017 |
Number of restricted stock unit awards that vested during the period |  |  | 123,769 |  |  |  | 213,984 |  |  |  | 97,115 |
Fair value of restricted stock unit awards that vested during the period |  | $ | 5,483 |  |  | $ | 7,260 |  |  | $ | 4,155 |
Accumulated dividends paid upon vesting of restricted stock unit awards |  | $ | 442 |  |  | $ | 662 |  |  | $ | 558 |
Income tax benefit recognized upon vesting of restricted stock unit awards |  | $ | 2,303 |  |  | $ | 3,049 |  |  | $ | 1,745 |
Compensation expense recognized during the period |  | $ | 6,158 |  |  | $ | 5,144 |  |  | $ | 4,297 |

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