Stock Incentive Plans (Summary Information Pertaining to Options Outstanding) (Details)	6 Months Ended
Jun. 30, 2019 $ / shares shares
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Expected volatility	16.88%
Expected dividends	3.24%
Expected term (in years)	6 years 6 months
Risk-free rate	1.83%
Options Outstanding \| shares	68,794
Weighted-Average Remaining Contractual Life	8 years 9 months 18 days
Weighted Average Exercise Price	$ 41.37
Options Exercisable \| shares	14,561
Weighted-Average Exercise Price	$ 39.49
$11.18 to 20.00 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise Price, Minimum	10.65
Exercise Price, Maximum	$ 20.00
Options Outstanding \| shares	1,386
Weighted-Average Remaining Contractual Life	3 years 7 months 6 days
Weighted Average Exercise Price	$ 13.70
Options Exercisable \| shares	1,386
Weighted-Average Exercise Price	$ 13.70
$20.01 to $30.00 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise Price, Minimum	20.01
Exercise Price, Maximum	$ 30.00
Options Outstanding \| shares	1,107
Weighted-Average Remaining Contractual Life	7 years 8 months 12 days
Weighted Average Exercise Price	$ 27.39
Options Exercisable \| shares	4
Weighted-Average Exercise Price	$ 26.18
$30.01 to 40.00 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise Price, Minimum	30.01
Exercise Price, Maximum	$ 40.00
Options Outstanding \| shares	8,820
Weighted-Average Remaining Contractual Life	8 years 10 months 25 days
Weighted Average Exercise Price	$ 39.36
Options Exercisable \| shares	1,680
Weighted-Average Exercise Price	$ 39.52
$40.00 to 44.75 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise Price, Minimum	40.01
Exercise Price, Maximum	$ 42.62
Options Outstanding \| shares	57,481
Weighted-Average Remaining Contractual Life	8 years 10 months 25 days
Weighted Average Exercise Price	$ 42.62
Options Exercisable \| shares	11,491
Weighted-Average Exercise Price	$ 42.62

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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- Definition

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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