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CAPITAL STOCK (Tables) | 12 Months Ended
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Dec. 31, 2012
Treasury stock | Below is a summary of the Company’s treasury stock activity for the years ended December 31, 2011 and 2012:
|  | Number of Treasury Shares |  |  | Cost |
Balance at January 1, 2011 |  |  | 3,359,859 |  |  | $ | 44,725 |
Restricted stock forfeitures (1) |  |  | 1,920 |  |  |  | — |
Restricted stock withholdings (2) |  |  | 25,200 |  |  |  | 494 |
Restricted stock awards canceled (1) |  |  | 4,613 |  |  |  | — |
Balance at December 31, 2011 |  |  | 3,391,592 |  |  | $ | 45,219 |
Restricted stock forfeitures (1) |  |  | 14,423 |  |  |  | — |
Restricted stock withholdings (2) |  |  | 147,070 |  |  |  | 3,263 |
Balance at December 31, 2012 |  |  | 3,553,085 |  |  | $ | 48,482 |
(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 $19.60 to $22.50 per share.
Stock Options | Below is a summary of stock option activity and related information for the years ended December 31, 2010, 2011 and 2012:
|  | Year Ended December 31, 2010 |  |  | Year Ended December 31, 2011 |  |  | Year Ended December 31, 2012 |  |  |  |
|  | Shares |  |  | Weighted Average Exercise Price |  |  | Shares |  |  | Weighted Average Exercise Price |  |  | Shares |  |  | Weighted Average Exercise Price |  |  | Aggregate Intrinsic Value |
Outstanding at January 1 |  |  | 1,231,892 |  |  | $ | 7.63 |  |  |  | 140,356 |  |  | $ | 7.63 |  |  |  | 82,166 |  |  | $ | 7.63 |  |  |  |  |
Exercised |  |  | (1,091,536 | ) |  | $ | 7.63 |  |  |  | (58,190 | ) |  | $ | 7.63 |  |  |  | (60,144 | ) |  | $ | 7.63 |  |  |  |  |
Outstanding at December 31 |  |  | 140,356 |  |  | $ | 7.63 |  |  |  | 82,166 |  |  | $ | 7.63 |  |  |  | 22,022 |  |  | $ | 7.63 |  |  | $ | 404 |
Vested options at December 31 |  |  | 140,356 |  |  | $ | 7.63 |  |  |  | 82,166 |  |  | $ | 7.63 |  |  |  | 22,022 |  |  | $ | 7.63 |  |  | $ | 404 |
Restricted stock | Below is a summary of restricted stock activity for the years ended December 31, 2010, 2011 and 2012:
|  | Year Ended December 31, 2010 |  |  | Year Ended December 31, 2011 |  |  | Year Ended December 31, 2012 |
|  | Shares |  |  | Weighted Average Exercise Price |  |  | Shares |  |  | Weighted Average Exercise Price |  |  | Shares |  |  | Weighted Average Exercise Price |
Outstanding at January 1 |  |  | 764,078 |  |  | $ | 11.10 |  |  |  | 1,254,691 |  |  | $ | 14.60 |  |  |  | 1,384,390 |  |  | $ | 16.85 |
Granted |  |  | 683,921 |  |  | $ | 17.94 |  |  |  | 424,436 |  |  | $ | 19.45 |  |  |  | 653,229 |  |  | $ | 21.70 |
Vested |  |  | (190,589 | ) |  | $ | 12.63 |  |  |  | (288,204 | ) |  | $ | 10.84 |  |  |  | (489,033 | ) |  | $ | 17.00 |
Canceled |  |  | — |  |  | $ | — |  |  |  | (4,613 | ) |  | $ | 18.35 |  |  |  | — |  |  | $ | — |
Forfeited |  |  | (2,719 | ) |  | $ | 11.03 |  |  |  | (1,920 | ) |  | $ | 14.34 |  |  |  | (14,423 | ) |  | $ | 18.58 |
Outstanding at December 31 |  |  | 1,254,691 |  |  | $ | 14.60 |  |  |  | 1,384,390 |  |  | $ | 16.85 |  |  |  | 1,534,163 |  |  | $ | 18.85 |
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, 2010, 2011 and 2012 at each of the three levels of financial performance (excluding forfeitures):
|  | Granted During the Year Ended December 31, |
|  | 2010 |  |  | 2011 |  |  | 2012 |
|  | Number of Shares Vesting |  |  | Value at Grant |  |  | Number of Shares Vesting |  |  | Value at Grant |  |  | Number of Shares Vesting |  |  | Value at Grant |
at IRR of at least 8.5% |  |  | 132,144 |  |  | $ | 2,423 |  |  |  | 51,239 |  |  | $ | 991 |  |  |  | 50,981 |  |  | $ | 1,103 |
at IRR of at least 10.5% |  |  | 264,288 |  |  | $ | 4,847 |  |  |  | 102,488 |  |  | $ | 1,983 |  |  |  | 101,974 |  |  | $ | 2,206 |
at IRR of at least 12.5% |  |  | 396,429 |  |  | $ | 7,271 |  |  |  | 153,727 |  |  | $ | 2,975 |  |  |  | 152,955 |  |  | $ | 3,308 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired 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 an entity's treasury stock, including the average cost per share, carrying basis for each class of treasury stock, description of share repurchase program authorized by an entity's board of directors, the number of shares repurchased, the cost of the shares repurchased, the remaining maximum dollar value of shares available for repurchase under the program, the treatment of the purchase price in excess of the current market value, number of shares held for each class of treasury stock, and other information necessary to a fair presentation. + References Reference 1: 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 Reference 2: 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 3: 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 4: 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 + Details
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