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CAPITAL STOCK (Tables) | 12 Months Ended
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Dec. 31, 2015
Treasury Stock | Below is a summary of the Company’s treasury stock activity for the years ended December 31, 2013, 2014 and 2015:
|  | Number of |  |  |  |
|  | Treasury Shares |  |  | Cost |
Balance at January 1, 2013 |  |  | 3,553,085 |  |  | $ | 48,482 |
Restricted stock forfeitures (1) |  |  | 22,653 |  |  |  | — |
Restricted stock withholdings (2) |  |  | 119,197 |  |  |  | 3,464 |
Balance at December 31, 2013 |  |  | 3,694,935 |  |  | $ | 51,946 |
Restricted stock forfeitures (1) |  |  | 25,947 |  |  |  | — |
Restricted stock withholdings (2) |  |  | 336,253 |  |  |  | 9,861 |
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 |
(1) | The Company repurchased forfeited and canceled restricted shares at a cost of $0.001 per share in accordance with the Company’s Amended and Restated 2006 Long Term 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 $28.84 to $44.67 per share.
Stock Options | Below is a summary of stock option activity and related information for the years ended December 31, 2013 and 2014:
|  | Year Ended December 31, 2013 |  |  | Year Ended December 31, 2014 |
|  | Number of Options |  |  | Weighted Average Exercise Price |  |  | Number of Options |  |  | Weighted Average Exercise Price |
Outstanding at January 1 |  |  | 22,022 |  |  | $ | 7.63 |  |  |  | 14,584 |  |  | $ | 7.63 |
Exercised |  |  | (7,438 | ) |  | $ | 7.63 |  |  |  | (14,584 | ) |  | $ | 7.63 |
Outstanding at December 31 |  |  | 14,584 |  |  | $ | 7.63 |  |  |  | — |  |  |  |  |
Vested options at December 31 |  |  | 14,584 |  |  | $ | 7.63 |  |  |  | — |  |  |  |  |
Restricted Stock | Below is a summary of restricted stock activity for the years ended December 31, 2013, 2014 and 2015:
|  | Year Ended December 31, 2013 |  |  | Year Ended December 31, 2014 |  |  | Year Ended December 31, 2015 |
|  | 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 |  |  | 1,534,163 |  |  | $ | 18.85 |  |  |  | 1,260,913 |  |  | $ | 21.86 |  |  |  | 878,897 |  |  | $ | 24.92 |
Granted |  |  | 271,532 |  |  | $ | 30.09 |  |  |  | 269,774 |  |  | $ | 28.93 |  |  |  | 226,212 |  |  | $ | 42.79 |
Vested |  |  | (522,129 | ) |  | $ | 17.27 |  |  |  | (625,843 | ) |  | $ | 20.53 |  |  |  | (329,437 | ) |  | $ | 23.72 |
Forfeited |  |  | (22,653 | ) |  | $ | 22.92 |  |  |  | (25,947 | ) |  | $ | 22.94 |  |  |  | (17,897 | ) |  | $ | 27.58 |
Outstanding at December 31 |  |  | 1,260,913 |  |  | $ | 21.86 |  |  |  | 878,897 |  |  | $ | 24.92 |  |  |  | 757,775 |  |  | $ | 30.73 |
Summary of Restricted Stock Award Activity | Below is a summary of restricted stock award activity recorded for the periods indicated:
|  | Year Ended December 31, |
|  | 2013 |  |  | 2014 |  |  | 2015 |
Compensation expense recognized during the period |  | $ | 12,738 |  |  | $ | 9,534 |  |  | $ | 9,600 |
Fair value of restricted shares that vested during the period |  | $ | 10,161 |  |  | $ | 18,773 |  |  | $ | 14,424 |
Income tax deduction upon vesting of restricted stock awards |  | $ | 4,268 |  |  | $ | 5,625 |  |  | $ | 3,823 |
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 years ended December 31, 2013, 2014 and 2015 at each of the three levels of financial performance (excluding forfeitures):
|  | Granted During the Year Ended December 31, |
|  | 2013 |  |  | 2014 |  |  | 2015 |
|  | Number of |  |  | Value at |  |  | Number of |  |  | Value at |  |  | Number of |  |  | Value at |
|  | Units |  |  | Grant (1) |  |  | Units |  |  | Grant (1) |  |  | Units |  |  | Grant (1) |
at IRR of at least 8.5% (7.5% for 2015 grant) |  |  | 38,366 |  |  | $ | 1,129 |  |  |  | 65,832 |  |  | $ | 1,879 |  |  |  | 47,640 |  |  | $ | 2,057 |
at IRR of at least 10.5% (9.5% for 2015 grant) |  |  | 76,741 |  |  | $ | 2,259 |  |  |  | 131,683 |  |  | $ | 3,758 |  |  |  | 95,282 |  |  | $ | 4,115 |
at IRR of at least 12.5% (11.5% for 2015 grant) |  |  | 115,107 |  |  | $ | 3,389 |  |  |  | 197,515 |  |  | $ | 5,637 |  |  |  | 142,917 |  |  | $ | 6,173 |
(1) | The weighted average grant date fair values for units issued during the years ended December 31, 2013, 2014, and 2015 were $29.44, $28.54 and $43.19, respectively.
Summary of Activity for Restricted Stock Unit Awards | Below is a summary of activity for restricted stock unit awards for the periods indicated:
|  | Year Ended December 31, |
|  | 2013 |  |  | 2014 |  |  | 2015 |
Number of restricted stock unit awards that vested during the period |  |  | 295,751 |  |  |  | 395,751 |  |  |  | 123,769 |
Fair value of restricted stock unit awards that vested during the period |  | $ | 8,723 |  |  | $ | 11,420 |  |  | $ | 5,483 |
Accumulated dividends paid upon vesting of restricted stock unit awards |  | $ | 939 |  |  | $ | 1,352 |  |  | $ | 442 |
Income tax benefit recognized upon vesting of restricted stock unit awards |  | $ | 3,663 |  |  | $ | 4,796 |  |  | $ | 2,303 |
Compensation expense recognized during the period |  | $ | 4,148 |  |  | $ | 3,284 |  |  | $ | 6,158 |

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