Revenue Recognition (Schedule of Consolidated Balance Sheets) (Details) (Parenthetical) - $ / shares	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Preferred Stock, par value per share	$ 5.00	$ 5.00
Preferred Stock, shares authorized	2,000,000	2,000,000
Preferred Stock, shares issued	0	0
Common Stock, shares outstanding	32,300,000	32,200,000	32,100,000
Treasury stock, shares	8,418,620	8,431,335
Common Class A [Member]
Common Stock, par value per share	$ 0.001	$ 0.001
Common Stock, shares authorized	100,000,000	100,000,000
Common Stock, shares issued	37,450,329	37,395,753
Common Class B [Member]
Common Stock, par value per share	$ 0.001	$ 0.001
Common Stock, shares authorized	25,000,000	25,000,000
Common Stock, shares issued	3,233,998	3,233,998
Common Stock, shares outstanding	3,233,998	3,233,998
As reported [Member]
Preferred Stock, par value per share	$ 5.00
Preferred Stock, shares authorized	2,000,000
Preferred Stock, shares issued	0
As reported [Member] \| Common Class A [Member]
Common Stock, par value per share	$ 0.001
Common Stock, shares authorized	100,000,000
Common Stock, shares issued	37,450,329	37,395,753
Treasury stock, shares	8,418,620	8,431,335
As reported [Member] \| Common Class B [Member]
Common Stock, par value per share	$ 0.001
Common Stock, shares authorized	25,000,000
Common Stock, shares issued	3,233,998	3,233,998
Common Stock, shares outstanding	3,233,998	3,233,998
Adjustments to reverse effects of ASC 606 [Member]
Preferred Stock, par value per share	$ 5.00
Preferred Stock, shares authorized	2,000,000
Preferred Stock, shares issued	0
Adjustments to reverse effects of ASC 606 [Member] \| Common Class A [Member]
Common Stock, par value per share	$ 0.001
Common Stock, shares authorized	100,000,000
Common Stock, shares issued	37,450,329	37,395,753
Adjustments to reverse effects of ASC 606 [Member] \| Common Class B [Member]
Common Stock, par value per share	$ 0.001
Common Stock, shares authorized	25,000,000
Common Stock, shares issued	3,233,998	3,233,998
Common Stock, shares outstanding	3,233,998	3,233,998
As adjusted to exclude adoption of ASC 606 [Member]
Preferred Stock, par value per share	$ 5.00
Preferred Stock, shares authorized	2,000,000
Preferred Stock, shares issued	0
As adjusted to exclude adoption of ASC 606 [Member] \| Common Class A [Member]
Common Stock, par value per share	$ 0.001
Common Stock, shares authorized	100,000,000
Common Stock, shares issued	37,450,329	37,395,753
As adjusted to exclude adoption of ASC 606 [Member] \| Common Class B [Member]
Common Stock, par value per share	$ 0.001
Common Stock, shares authorized	25,000,000
Common Stock, shares issued	3,233,998	3,233,998
Common Stock, shares outstanding	3,233,998	3,233,998

Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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-Name Accounting Standards Codification
-Topic 505
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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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