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STOCK PLANS (Tables) | 12 Months Ended
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Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of stock option activity | The following table summarizes stock option activity for each of the three years ended December 31, 2012, under all Plans:
|  | Year Ended December 31,
|  | 2012 |  | 2011 |  | 2010
|  | Options |  | Weighted Average Exercise Price |  | Options |  | Weighted Average Exercise Price |  | Options |  | Weighted Average Exercise Price
Balance at beginning of year |  | 3,632,463 |  |  | $ | 26.05 |  |  | 3,779,824 |  |  | $ | 23.99 |  |  | 3,596,884 |  |  | $ | 22.28 |
Options granted |  | 412,980 |  |  | 47.66 |  |  | 459,263 |  |  | 35.34 |  |  | 491,010 |  |  | 31.29 |
Options exercised |  | (962,029 | ) |  | 19.52 |  |  | (572,795 | ) |  | 19.82 |  |  | (260,084 | ) |  | 13.49 |
Options canceled |  | (22,470 | ) |  | 24.07 |  |  | (33,829 | ) |  | 26.62 |  |  | (47,986 | ) |  | 27.84 |
Balance at end of year |  | 3,060,944 |  |  | 30.98 |  |  | 3,632,463 |  |  | 26.05 |  |  | 3,779,824 |  |  | 23.99 |
Exercisable at end of year |  | 2,208,455 |  |  | 27.19 |  |  | 2,677,071 |  |  | 23.73 |  |  | 2,749,168 |  |  | 22.40 |
Weighted average assumptions used for estimating fair value of options granted | The weighted average assumptions for each of the three years ended December 31, 2012 were as follows:
|  | Year Ended December 31,
|  | 2012 |  | 2011 |  | 2010
Expected volatility |  | 45.67 | % |  | 41.92 | % |  | 42.15 | %
Dividend yield |  | 1.66 | % |  | 1.63 | % |  | 2.02 | %
Risk-free interest rate |  | 0.70 | % |  | 0.80 | % |  | 1.64 | %
Expected option life (years) |  | 4.5 |  |  | 4.3 |  |  | 4.9 |
Weighted average fair value per option granted during the year |  | $ | 15.87 |  |  | $ | 10.97 |  |  | $ | 10.01 |
Summary of nonvested stock options | The following table summarizes non-vested stock options for the year ended December 31, 2012:
|  | Year Ended December 31, 2012
|  | Number of Options |  | Weighted Average Fair Value at Grant Date
Balance at beginning of year |  | 929,382 |  |  | $ | 10.78 |
Granted |  | 412,980 |  |  | 15.87 |
Vested |  | (470,243 | ) |  | 10.19 |
Forfeited |  | (19,630 | ) |  | 19.60 |
Balance at end of year |  | 852,489 |  |  | 13.63 |
Summary of information about awards outstanding, by exercise price range | The following table summarizes information about awards outstanding as of December 31, 2012:
|  | Outstanding |  | Exercisable |  |
Exercise Price Range |  | Number of Stock Options |  | Weighted Average Exercise Price |  | Number of Stock Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Life (years)
Under $19.99 |  | 449,884 |  |  | $ | 18.59 |  |  | 449,884 |  |  | $ | 18.59 |  |  | 2.4
$20.00 - $32.99 |  | 1,389,730 |  |  | 27.79 |  |  | 1,284,025 |  |  | 27.50 |  |  | 6.5
Over $33.00 |  | 1,221,330 |  |  | 39.18 |  |  | 474,546 |  |  | 34.50 |  |  | 8.0
|  | 3,060,944 |  |  |  |  |  | 2,208,455 |  |  |  |  |  | 6.5
Summary of restricted share award activity | The following table summarizes restricted share award activity for each of the three years ended December 31, 2012, under all Plans:
|  | Year Ended December 31,
|  | 2012 |  | 2011 |  | 2010
|  | Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value
Balance at beginning of year |  | 379,233 |  |  | $ | 28.06 |  |  | 523,730 |  |  | $ | 27.36 |  |  | 435,770 |  |  | $ | 26.61 |
Shares granted |  | 20,099 |  |  | 47.81 |  |  | 22,779 |  |  | 35.55 |  |  | 112,864 |  |  | 31.05 |
Shares vested* |  | (62,524 | ) |  | 32.10 |  |  | (159,842 | ) |  | 26.97 |  |  | (24,904 | ) |  | 31.07 |
Shares forfeited |  | — |  |  | — |  |  | (7,434 | ) |  | 24.67 |  |  | — |  |  | — |
Balance at end of year |  | 336,808 |  |  | 28.49 |  |  | 379,233 |  |  | 28.06 |  |  | 523,730 |  |  | 27.36 |
_______________________________________________________________________________
* | Includes shares vested but not exercisable
Summary of nonvested restricted shares awards | The following table summarizes non-vested restricted share awards for the year ended December 31, 2012:
|  | Year Ended December 31, 2012
|  | Number of Restricted Shares |  | Weighted Average Fair Value at Grant Date
Balance at beginning of year |  | 355,933 |  |  | $ | 28.18 |
Granted |  | 20,099 |  |  | 47.81 |
Vested |  | (57,944 | ) |  | 31.93 |
Balance at end of year |  | 318,088 |  |  | 28.74 |
Summary of restricted stock unit activity | The following table summarizes restricted stock unit activity for the years ended December 31, 2012 and 2011, under all Plans:
|  | Year Ended December 31,
|  | 2012 |  | 2011
|  | Units |  | Weighted Average Grant Date Fair Value |  | Units |  | Weighted Average Grant Date Fair Value
Non-vested at beginning of year |  | 166,519 |  |  | $ | 34.55 |  |  | — |  |  | $ | — |
Units granted |  | 133,944 |  |  | 47.97 |  |  | 166,519 |  |  | 34.55 |
Units vested |  | (10,499 | ) |  | 33.06 |  |  | — |  |  | — |
Units forfeited |  | (1,295 | ) |  | 35.55 |  |  | — |  |  | — |
Non-vested at end of year |  | 288,669 |  |  | 40.83 |  |  | 166,519 |  |  | 34.55 |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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