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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares shares in Thousands	Jun. 30, 2018	Dec. 31, 2017
Stockholders' equity
Preferred Stock, par value (in dollars per share)	$ 1	$ 1
Preferred Stock, shares authorized (in shares)	1,000	1,000
Preferred Stock, shares issued (in shares)	0	0
Common Stock, par value (in dollars per share)	$ 1	$ 1
Common Stock [Member]
Stockholders' equity
Common Stock, shares authorized (in shares)	50,000	50,000
Common Stock, shares issued (in shares)	29,065	28,950
Treasury Stock, common stock shares (in shares)	9,864	9,498
Convertible Class A Common Stock [Member]
Stockholders' equity
Common Stock, shares authorized (in shares)	15,000	15,000
Common Stock, shares issued (in shares)	2,289	2,290
Treasury Stock, common stock shares (in shares)	522	522

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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 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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