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SHARE-BASED COMPENSATION AND BENEFIT PLANS (Tables) | 12 Months Ended
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Dec. 31, 2012
Summary of Stock Option Activity | A summary of stock option activity under the 2001 Plan as of December 31, 2012, and changes during 2012, is as follows:
|  | Options |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value |
Options outstanding at January 1, 2012 |  |  | 385,150 |  |  | $ | 47.82 |  |  |  |  |  |  |  |  |
Granted |  |  | 80,500 |  |  |  | 71.52 |  |  |  |  |  |  |  |  |
Exercised |  |  | (135,500 | ) |  |  | 41.63 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (5,000 | ) |  |  | 55.04 |  |  |  |  |  |  |  |  |
Expired |  |  | (1,000 | ) |  |  | 37.28 |  |  |  |  |  |  |  |  |
Options outstanding at December 31, 2012 |  |  | 324,150 |  |  | $ | 56.21 |  |  |  | 2.94 |  |  | $ | 6,060 |
Options exercisable at December 31, 2012 |  |  | 57,567 |  |  | $ | 28.62 |  |  |  | 1.35 |  |  | $ | 2,664 |
Summary of Non-Vested (Restricted) Stock Activity | A summary of non-vested (restricted) stock activity as of December 31, 2012, and changes during 2012, is shown below:
|  | Shares |  |  | Weighted- Average Grant Date Fair Value |
Non-vested (restricted) stock outstanding at January 1, 2012 |  |  | 2,261,948 |  |  | $ | 37.23 |
Granted |  |  | 111,301 |  |  |  | 69.66 |
Vested |  |  | — |  |  |  | — |
Forfeited |  |  | — |  |  |  | — |
Non-vested (restricted) stock outstanding at December 31, 2012 |  |  | 2,373,249 |  |  | $ | 38.75 |
Weighted-Average Assumptions Relating to Valuation of Our Stock Options | The weighted-average assumptions relating to the valuation of our stock options were as follows:
Years Ended December 31, |  | 2012 |  |  | 2011 |  |  | 2010 |
Expected term in years |  |  | 4.25 |  |  |  | 4.25 |  |  |  | 4.25 |
Risk-free interest rate |  |  | 0.57 | % |  |  | 1.12 | % |  |  | 1.14 | %
Expected volatility |  |  | 31.40 | % |  |  | 32.59 | % |  |  | 33.35 | %
Expected dividend yield |  |  | 3.49 | % |  |  | 3.48 | % |  |  | 3.65 | %

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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 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 the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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