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Consolidated BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Stockholders' equity
Preferred Stock, par value (in dollars per share)	$ 1us-gaap_PreferredStockParOrStatedValuePerShare	$ 1us-gaap_PreferredStockParOrStatedValuePerShare
Preferred Stock, shares authorized (in shares)	1,000,000us-gaap_PreferredStockSharesAuthorized	1,000,000us-gaap_PreferredStockSharesAuthorized
Preferred Stock, shares issued (in shares)	0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued
Common Stock, par value (in dollars per share)	$ 1us-gaap_CommonStockParOrStatedValuePerShare	$ 1us-gaap_CommonStockParOrStatedValuePerShare
Common Stock [Member]
Stockholders' equity
Common Stock, shares authorized (in shares)	50,000,000us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	50,000,000us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Common Stock, shares issued (in shares)	28,327,000us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	27,853,000us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Treasury stock, Common stock shares (in shares)	7,759,000us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	7,731,000us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Convertible Class A Common Stock [Member]
Stockholders' equity
Common Stock, shares authorized (in shares)	15,000,000us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertibleCommonStockMember	15,000,000us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertibleCommonStockMember
Common Stock, shares issued (in shares)	2,603,000us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertibleCommonStockMember	2,915,000us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertibleCommonStockMember
Treasury stock, Common stock shares (in shares)	522,000us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertibleCommonStockMember	522,000us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertibleCommonStockMember

X

- Definition

Face amount or stated value per share of common stock.

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-Name Accounting Standards Codification

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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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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