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Earnings Per Common Share and Share Awards | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Earnings Per Common Share and Share Awards | Earnings Per Common Share and Share Awards Basic earnings per common share is computed by dividing net income attributable to the Company by the weighted average number of common shares outstanding during the reporting period. Diluted earnings per common share is computed by dividing net income attributable to the Company by the combination of dilutive potential common stock, comprised of shares issuable under the Company’s share-based compensation plans and the weighted average number of common shares outstanding during the reporting period. Dilutive common share equivalents include the dilutive effect of in-the-money share-based awards, which are calculated based on the average share price for each period using the treasury stock method. Under the treasury stock method, when share-based awards are exercised, (a) the exercise price of a share-based award and (b) the amount of compensation cost, if any, for future services that the Company has not yet recognized, are assumed to be used to repurchase shares in the current period. The following table sets forth the computation of basic and diluted earnings per share for the years ended December 31:
(in thousands, except per share amounts) | 2018 |  | 2017 |  | 2016
Net income attributable to the Company | $ | 21,892 |  |  | $ | 25,707 |  |  | $ | 19,523 |
Weighted average common shares outstanding – Basic | 1,887 |  |  | 1,886 |  |  | 1,908 |
Incremental shares outstanding assuming the exercise of dilutive stock options and SARs (share-settled) | 10 |  |  | 10 |  |  | 7 |
Weighted average common shares outstanding – Diluted | 1,897 |  |  | 1,896 |  |  | 1,915 |
Basic earnings per common share | $ | 11.60 |  |  | $ | 13.63 |  |  | $ | 10.23 |
Diluted earnings per common share | $ | 11.54 |  |  | $ | 13.56 |  |  | $ | 10.19 |
There were 9 thousand and 4 thousand potential shares excluded from the computation of diluted earnings per share in 2018 and 2017, respectively. There were no potential shares excluded from the computation of diluted earnings per share in 2016. The Company historically has adopted employee stock award plans under which restricted stock, and options or stock appreciation rights ("SARs") of the Company's stock may be granted to key employees or directors of the Company at a price not less than the market value on the date of grant. There is currently one active plan from which the Company may grant share-based awards. The awards eligible to be granted under the active plan are limited to SARs, and the maximum aggregate number of shares of common stock of the Company available pursuant to the plan for the grant of SARs is 250 thousand shares. A summary of share-based award transactions for all share-based award plans follows:
(in thousands, except weighted average exercise price and average remaining contractual term) | Number Of Shares |  | Weighted Average Exercise Price |  | Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value
Outstanding as of January 1, 2016 | 22 |  |  | $ | 57.04 |  |  | 3.93 |  | $ | 945 |
SARs granted | 5 |  |  | 93.87 |  |  |  |  |  |
SARs exercised | (2 | ) |  | 32.00 |  |  |  |  |  |
Outstanding as of December 31, 2016 | 25 |  |  | $ | 65.85 |  |  | 3.85 |  | $ | 837 |
SARs granted | 4 |  |  | 192.71 |  |  |  |  |  |
SARs exercised | (4 | ) |  | 36.38 |  |  |  |  |
Outstanding as of December 31, 2017 | 25 |  |  | $ | 93.40 |  |  | 3.98 |  | $ | 2,624 |
SARs granted | 4 |  |  | 188.71 |  |  |  |  |  |
SARs exercised | (1 | ) |  | 41.50 |  |  |  |  |  |
Outstanding as of December 31, 2018 | 28 |  |  | $ | 110.27 |  |  | 3.64 |  | $ | 2,019 |
Exercisable as of December 31, 2018 | 27 |  |  | $ | 107.05 |  |  | 3.53 |  | $ | 2,019 |
Unvested as of December 31, 2018 | 1 |  |  | $ | 188.71 |  |  | 6.38 |  | $ | — |
The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the quoted price of the Company’s common stock at December 31, 2018. The intrinsic values of SARs exercised during 2018, 2017 and 2016 were approximately $153 thousand, $473 thousand and $117 thousand, respectively. There were no options outstanding at December 31, 2018. The following table summarizes information about SARs outstanding at December 31, 2018:
(in thousands, except exercise prices and average remaining contractual term) |  | SARs Outstanding at Year-End |  | SARs Exercisable at Year-End
Range of Exercise Prices |  | Number Outstanding |  | Weighted Average Remaining Contractual Life |  | Weighted Average Exercise Price |  | Number Exercisable |  | Weighted Average Exercise Price
$ | 50.00 |  |  | — |  | $ | 59.99 |  |  | 3 |  |  | 0.37 |  | $ | 50.50 |  |  | 3 |  |  | $ | 50.50 |
60.00 |  |  | — |  | 69.99 |  |  | 4 |  |  | 2.39 |  | 68.70 |  |  | 4 |  |  | 68.70 |
70.00 |  |  | — |  | 79.99 |  |  | 8 |  |  | 2.58 |  | 72.44 |  |  | 8 |  |  | 72.44 |
90.00 |  |  | — |  | 99.99 |  |  | 4 |  |  | 4.38 |  | 93.87 |  |  | 4 |  |  | 93.87 |
150.00 |  |  | — |  | 199.99 |  |  | 9 |  |  | 5.88 |  | 190.71 |  |  | 8 |  |  | 191.00 |
$ | 50.00 |  |  | — |  | $ | 199.99 |  |  | 28 |  |  | 3.64 |  | $ | 110.27 |  |  | 27 |  |  | $ | 107.05 |
In 2018, 4 thousand SARs vested with a fair value of approximately $327 thousand. During the second quarters of 2018, 2017 and 2016, the Company issued share-settled SARs to the directors of the Company. SARs give the holder the right to receive stock equal to the appreciation in the value of shares of stock from the grant date for a specified period of time, and as a result, are accounted for as equity instruments. The fair value of each award is estimated on the date of grant using the Black-Scholes option valuation model with the weighted average assumptions noted in the table shown below. Expected volatilities are based on both the implied and historical volatility of the Company’s stock. The Company uses historical data to project SAR exercises and pre-exercise forfeitures within the valuation model. The expected term of awards represents the period of time that SARs granted are expected to be outstanding. The interest rate assumed for the expected life of the award is based on the U.S. Treasury yield curve in effect at the time of the grant. The weighted average fair values for the SARs issued during 2018, 2017 and 2016 were $78.61, $55.40 and $28.75, respectively, and were estimated using the weighted average assumptions shown in the table below.
| 2018 |  | 2017 |  | 2016
Expected life in years | 7.0 |  | 7.0 |  | 7.0
Volatility | 39.0% |  | 26.2% |  | 28.9%
Interest rate | 3.1% |  | 2.0% |  | 1.7%
Yield rate | 0.8% |  | 0.8% |  | 0.7%
There was approximately $327 thousand, $219 thousand and $132 thousand of compensation expense relating to SARs vesting on or before December 31, 2018, 2017 and 2016, respectively, included in salaries, employee benefits and payroll taxes in the Consolidated Statements of Income. As of December 31, 2018, there was approximately $88 thousand of total unrecognized compensation cost related to unvested share-based compensation arrangements granted under the Company’s stock award plans. That cost is expected to be recognized over a weighted average period of approximately 3 months. The estimated weighted average grant-date fair value of SARs granted for the years ended December 31, was as follows:
| 2018 |  | 2017 |  | 2016
Exercise price equal to market price on date of grant: |  |  |  |  |
Weighted average market price | $ | 188.71 |  |  | $ | 192.71 |  |  | $ | 93.87 |
Weighted average grant-date fair value | $ | 78.61 |  |  | $ | 55.40 |  |  | $ | 28.75 |
There have been no stock options or SARs granted where the exercise price was less than the market price on the date of grant.

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