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Earnings Per Common Share And Share Awards (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Computation Of Basic And Diluted Earnings Per Share | The following table sets forth the computation of basic and diluted earnings per share for the three- and six-month periods ended June 30:
| Three Months Ended June 30, |  | Six Months Ended June 30,
(in thousands, except per share amounts) | 2018 |  | 2017 |  | 2018 |  | 2017
Net income attributable to the Company | $ | 6,947 |  |  | $ | 5,675 |  |  | $ | 11,123 |  |  | $ | 10,151 |
Weighted average common shares outstanding – Basic | 1,887 |  |  | 1,887 |  |  | 1,886 |  |  | 1,886 |
Incremental shares outstanding assuming the exercise of dilutive SARs (share-settled) | 10 |  |  | 10 |  |  | 10 |  |  | 10 |
Weighted average common shares outstanding – Diluted | 1,897 |  |  | 1,897 |  |  | 1,896 |  |  | 1,896 |
Basic earnings per common share | $ | 3.68 |  |  | $ | 3.01 |  |  | $ | 5.90 |  |  | $ | 5.38 |
Diluted earnings per common share | $ | 3.66 |  |  | $ | 2.99 |  |  | $ | 5.87 |  |  | $ | 5.35 |
Summary Of Share-Based Award Transactions | 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, 2017 | 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 |  | $ | 837 |
SARs granted | 4 |  |  | 188.71 |  |  |  |  |  |
SARs exercised | (1 | ) |  | 41.50 |  |  |  |  |  |
Outstanding as of June 30, 2018 | 28 |  |  | $ | 110.27 |  |  | 4.15 |  | $ | 2,175 |
Exercisable as of June 30, 2018 | 25 |  |  | $ | 99.73 |  |  | 3.78 |  | $ | 2,175 |
Unvested as of June 30, 2018 | 3 |  |  | $ | 188.71 |  |  | 6.88 |  | $ | — |
Share-Based Valuation Assumptions | The weighted average fair values for the SARs issued during 2018 and 2017 were $78.61 and $55.40, respectively, and were estimated using the weighted average assumptions shown in the table below.
| 2018 |  | 2017
Expected Life in Years | 7.0 |  | 7.0
Volatility | 39.0% |  | 26.2%
Interest Rate | 3.1% |  | 2.0%
Yield Rate | 0.8% |  | 0.8%

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&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=96867065&loc=d3e5070-113901 + Details
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