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STOCK PLANS | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
STOCK PLANS | STOCK PLANS On April 23, 2015, the shareholders of the Company approved the 2015 Equity and Incentive Compensation Plan ("Employee Plan"), which replaced the 2006 Equity and Performance Incentive Plan, as amended ("EPI Plan"). The Employee Plan provides for the granting of options, appreciation rights, restricted shares, restricted stock units and performance-based awards up to an additional 5,400,000 of the Company's common shares. In addition, on April 23, 2015, the shareholders of the Company approved the 2015 Stock Plan for Non-Employee Directors ("2015 Director Plan"), which replaced the 2006 Stock Plan for Non-Employee Directors ("2006 Director Plan"). The 2015 Director Plan provides for the granting of options, restricted shares and restricted stock units up to an additional 300,000 of the Company's common shares. At December 31, 2017, there were 4,324,951 common shares available for future grant under all plans. Stock Options The following table summarizes stock option activity for the year ended December 31, 2017 under all Plans:
|  | Year Ended December 31,
|  | 2017
|  | Number of Options |  | Weighted Average Exercise Price
Balance at beginning of year |  | 1,609,702 |  |  | $ | 51.32 |
Options granted |  | 182,615 |  |  | 85.43 |
Options exercised |  | (401,233 | ) |  | 41.44 |
Options canceled |  | (28,636 | ) |  | 68.18 |
Balance at end of year |  | 1,362,448 |  |  | 58.45 |
Exercisable at end of year |  | 952,889 |  |  | 52.57 |
Options granted under both the Employee Plan and its predecessor plans may be outstanding for a maximum of 10 years from the date of grant. The majority of options granted vest ratably over a period of three years from the grant date. The exercise prices of all options were equal to the quoted market price of the Company's common shares at the date of grant. The Company issued shares of common stock from treasury upon all exercises of stock options in 2017. In 2017, all options issued were under the Employee Plan. The Company uses the Black-Scholes option pricing model for estimating fair values of options. In estimating the fair value of options granted, the expected option life is based on the Company's historical experience. The expected volatility is based on historical volatility. The weighted average assumptions for each of the three years ended December 31 were as follows:
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Expected volatility |  | 25.77 | % |  | 28.86 | % |  | 30.73 | %
Dividend yield |  | 1.62 | % |  | 1.70 | % |  | 1.48 | %
Risk-free interest rate |  | 1.90 | % |  | 1.27 | % |  | 1.32 | %
Expected option life (years) |  | 4.5 |  |  | 4.5 |  |  | 4.5 |
Weighted average fair value per option granted during the year |  | $ | 17.50 |  |  | $ | 12.55 |  |  | $ | 16.35 |
The following table summarizes non-vested stock options for the year ended December 31, 2017:
|  | Year Ended December 31, 2017
|  | Number of Options |  | Weighted Average Fair Value at Grant Date
Balance at beginning of year |  | 458,382 |  |  | $ | 14.32 |
Granted |  | 182,615 |  |  | 17.50 |
Vested |  | (205,066 | ) |  | 14.82 |
Forfeited |  | (26,372 | ) |  | 14.58 |
Balance at end of year |  | 409,559 |  |  | 15.47 |
The aggregate intrinsic value of options outstanding and exercisable which would have been received by the optionees had all awards been exercised at December 31, 2017 was $45,139 and $37,169, respectively. The total intrinsic value of awards exercised during 2017, 2016 and 2015 was $19,328, $30,967 and $6,879, respectively. The total fair value of options that vested during 2017, 2016 and 2015 was $3,040, $2,865 and $3,273, respectively. The following table summarizes information about awards outstanding as of December 31, 2017:
|  | 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 $49.99 |  | 508,257 |  |  | $ | 38.79 |  |  | 3.9 |  | 508,257 |  |  | $ | 38.79 |  |  | 3.9
$50.00 - $59.99 |  | 224,894 |  |  | 58.11 |  |  | 8.1 |  | 75,615 |  |  | 58.07 |  |  | 8.1
Over $60.00 |  | 629,297 |  |  | 74.45 |  |  | 7.3 |  | 369,017 |  |  | 70.43 |  |  | 6.5
|  | 1,362,448 |  |  |  |  |  | 6.2 |  | 952,889 |  |  |  |  |  | 5.2
Restricted Share Awards ("RSAs") The following table summarizes restricted share award activity for the year ended December 31, 2017 under all Plans:
|  | Year Ended December 31,
|  | 2017
|  | Number of Shares |  | Weighted Average Grant Date Fair Value
Balance at beginning of year |  | 46,159 |  |  | $ | 64.65 |
Shares granted |  | 13,910 |  |  | 89.82 |
Shares vested |  | (12,213 | ) |  | 90.37 |
Balance at end of year |  | 47,856 |  |  | 71.54 |
RSAs are valued at the quoted market price on the grant date. The majority of RSAs vest over a period of three to five years. The Company issued common shares from treasury upon the granting of RSAs in 2017. Restricted shares issued in 2017 were under the 2015 Director Plan. The remaining weighted average vesting period of all non-vested RSAs is 1.2 years as of December 31, 2017. Restricted Stock Units ("RSUs") and Performance Share Units ("PSUs") The following table summarizes RSU and PSU activity for the year ended December 31, 2017 under all Plans:
|  | Year Ended December 31,
|  | 2017
|  | Number of Units |  | Weighted Average Grant Date Fair Value
Balance at beginning of year |  | 376,784 |  |  | $ | 59.75 |
Units granted |  | 145,245 |  |  | 85.69 |
Units vested |  | (71,845 | ) |  | 49.39 |
Units forfeited |  | (31,218 | ) |  | 66.68 |
Balance at end of year |  | 418,966 |  |  | 69.98 |
RSUs are valued at the quoted market price on the grant date. The majority of RSUs vest over a period of three to five years. The Company issues shares of common stock from treasury upon the vesting of RSUs and any earned dividend equivalents. Conversion of 10,193 RSUs to common shares in 2017 were deferred as part of the 2005 Deferred Compensation Plan for Executives (the "2005 Plan"). As of December 31, 2017, 96,180 RSUs, including related dividend equivalents, have been deferred under the 2005 Plan. These units are reflected within dilutive shares in the calculation of earnings per share. In 2017, 110,585 RSUs were issued under the Employee Plan. The remaining weighted average vesting period of all non-vested RSUs is 1.9 years as of December 31, 2017. PSUs are valued at the quoted market price on the grant date. PSUs vest over a three-year period and are based on the Company's performance relative to pre-established performance goals. The Company issues common stock from treasury upon the vesting of PSUs and any earned dividend equivalents. In 2017, the Company issued 34,660 PSU's and has 75,285 PSUs outstanding under the Employee Plan at a weighted average fair value of $70.09 per share. The remaining weighted average vesting period of all non-vested PSUs is 1.6 years as of December 31, 2017. Stock-Based Compensation Expense Expense is recognized for all awards of stock-based compensation by allocating the aggregate grant date fair value over the vesting period. No expense is recognized for any stock options, restricted or deferred shares, RSUs or PSUs ultimately forfeited because recipients fail to meet vesting requirements. Total stock-based compensation expense recognized in the Consolidated Statements of Income for 2017, 2016 and 2015 was $12,698, $10,332 and $7,932, respectively. The related tax benefit for 2017, 2016 and 2015 was $4,861, $3,955 and $3,037, respectively. As of December 31, 2017, total unrecognized stock-based compensation expense related to non-vested stock options, RSAs, RSUs and PSUs was $20,022, which is expected to be recognized over a weighted average period of approximately 1.9 years years. Lincoln Stock Purchase Plan The 1995 Lincoln Stock Purchase Plan provides employees the ability to purchase open market shares on a commission-free basis up to a limit of ten thousand dollars annually. Under this plan, 800,000 shares have been authorized to be purchased. Shares purchased were 10,458 in 2017, 15,827 in 2016 and 16,012 in 2015.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 + Details
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