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Condensed Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Customer receivables, allowances	$ 9,738us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	$ 9,069us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Common stock, par value	$ 0.10us-gaap_CommonStockParOrStatedValuePerShare	$ 0.10us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized	140,000,000us-gaap_CommonStockSharesAuthorized	140,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares outstanding	85,913,659us-gaap_CommonStockSharesOutstanding	86,094,297us-gaap_CommonStockSharesOutstanding

X

- Definition

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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-Publisher FASB

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- Definition

Face amount or stated value per share of common stock.

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- Definition

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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