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STOCK PLANS (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of stock option activity | The following table summarizes stock option activity for the years ended December 31, 2015, 2014 and 2013, under all Plans:
|  | Year Ended December 31,
|  | 2015 |  | 2014 |  | 2013
|  | Options |  | Weighted Average Exercise Price |  | Options |  | Weighted Average Exercise Price |  | Options |  | Weighted Average Exercise Price
Balance at beginning of year |  | 2,087,193 |  |  | $ | 37.80 |  |  | 2,452,648 |  |  | $ | 36.52 |  |  | 3,060,944 |  |  | $ | 30.98 |
Options granted |  | 323,130 |  |  | 69.14 |  |  | 5,121 |  |  | 69.61 |  |  | 273,105 |  |  | 70.88 |
Options exercised |  | (197,582 | ) |  | 30.35 |  |  | (329,986 | ) |  | 27.63 |  |  | (774,783 | ) |  | 26.20 |
Options canceled |  | (18,092 | ) |  | 66.51 |  |  | (40,590 | ) |  | 47.21 |  |  | (106,618 | ) |  | 40.54 |
Balance at end of year |  | 2,194,649 |  |  | 42.85 |  |  | 2,087,193 |  |  | 37.80 |  |  | 2,452,648 |  |  | 36.52 |
Exercisable at end of year |  | 1,807,427 |  |  | 37.15 |  |  | 1,818,218 |  |  | 33.89 |  |  | 1,837,014 |  |  | 29.93 |
Weighted average assumptions used for estimating fair value of options granted | The weighted average assumptions for each of the three years ended December 31, 2015 were as follows:
|  | Year Ended December 31,
|  | 2015 |  | 2014 |  | 2013
Expected volatility |  | 30.73 | % |  | 32.21 | % |  | 32.97 | %
Dividend yield |  | 1.48 | % |  | 1.41 | % |  | 1.40 | %
Risk-free interest rate |  | 1.32 | % |  | 1.61 | % |  | 1.52 | %
Expected option life (years) |  | 4.5 |  |  | 4.4 |  |  | 4.4 |
Weighted average fair value per option granted during the year |  | $ | 16.35 |  |  | $ | 17.52 |  |  | $ | 18.14 |
Summary of nonvested stock options | The following table summarizes non-vested stock options for the year ended December 31, 2015:
|  | Year Ended December 31, 2015
|  | Number of Options |  | Weighted Average Fair Value at Grant Date
Balance at beginning of year |  | 268,975 |  |  | $ | 17.48 |
Granted |  | 323,130 |  |  | 16.35 |
Vested |  | (189,681 | ) |  | 17.26 |
Forfeited |  | (15,202 | ) |  | 17.15 |
Balance at end of year |  | 387,222 |  |  | 16.66 |
Summary of information about awards outstanding, by exercise price range | The following table summarizes information about awards outstanding as of December 31, 2015:
|  | Outstanding |  | Exercisable
Exercise Price Range |  | Number of Stock Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Life (years) |  | Number of Stock Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Life (years)
Under $29.99 |  | 491,072 |  |  | $ | 24.56 |  |  | 3.5 |  | 491,072 |  |  | $ | 24.56 |  |  | 3.5
$30.00 - $39.99 |  | 825,161 |  |  | 33.18 |  |  | 4.4 |  | 825,161 |  |  | 33.18 |  |  | 4.4
Over $40.00 |  | 878,416 |  |  | 62.15 |  |  | 8.0 |  | 491,194 |  |  | 56.40 |  |  | 7.3
|  | 2,194,649 |  |  |  |  |  | 5.7 |  | 1,807,427 |  |  |  |  |  | 5.0
Summary of restricted share award activity | The following table summarizes restricted share award activity for the years ended December 31, 2015, 2014 and 2013, under all Plans:
|  | Year Ended December 31,
|  | 2015 |  | 2014 |  | 2013
|  | 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 |  | 49,490 |  |  | $ | 60.14 |  |  | 115,316 |  |  | $ | 39.55 |  |  | 336,808 |  |  | $ | 28.49 |
Shares granted |  | 20,476 |  |  | 53.94 |  |  | 14,927 |  |  | 66.32 |  |  | 14,464 |  |  | 70.88 |
Shares vested |  | (20,745 | ) |  | 49.37 |  |  | (80,753 | ) |  | 31.88 |  |  | (224,021 | ) |  | 25.68 |
Shares forfeited |  | (4,592 | ) |  | 64.61 |  |  | — |  |  | — |  |  | (11,935 | ) |  | 25.76 |
Balance at end of year |  | 44,629 |  |  | 61.84 |  |  | 49,490 |  |  | 60.14 |  |  | 115,316 |  |  | 39.55 |
Summary of restricted stock unit activity | The following table summarizes restricted stock unit activity for the years ended December 31, 2015, 2014 and 2013, under all Plans:
|  | Year Ended December 31,
|  | 2015 |  | 2014 |  | 2013
|  | Units |  | Weighted Average Grant Date Fair Value |  | Units |  | Weighted Average Grant Date Fair Value |  | Units |  | Weighted Average Grant Date Fair Value
Balance at beginning of year |  | 241,496 |  |  | $ | 49.34 |  |  | 283,944 |  |  | $ | 47.38 |  |  | 288,669 |  |  | $ | 40.83 |
Units granted |  | 67,800 |  |  | 68.82 |  |  | 2,861 |  |  | 70.71 |  |  | 69,925 |  |  | 67.17 |
Units vested |  | (76,996 | ) |  | 37.21 |  |  | (40,035 | ) |  | 36.59 |  |  | (33,698 | ) |  | 39.20 |
Units forfeited |  | (10,768 | ) |  | 57.98 |  |  | (5,274 | ) |  | 52.19 |  |  | (40,952 | ) |  | 41.70 |
Balance at end of year |  | 221,532 |  |  | 59.10 |  |  | 241,496 |  |  | 49.34 |  |  | 283,944 |  |  | 47.38 |

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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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