Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Consolidated Financial Statements
Accounts receivable, allowance for doubtful accounts	$ 1,224	$ 1,729
Other intangible assets, accumulated amortization	9,774	9,748
Other long-term liabilities, deferred income taxes	$ 59,532	$ 65,788
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	250,000,000us-gaap_CommonStockSharesAuthorized	250,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued (in shares)	119,606,551us-gaap_CommonStockSharesIssued	119,186,705us-gaap_CommonStockSharesIssued
Treasury stock, shares (in shares)	57,832,362us-gaap_TreasuryStockShares	56,600,972us-gaap_TreasuryStockShares

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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