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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Accounts and other receivables, allowance for doubtful accounts and sales returns	$ 2,610us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	$ 3,327us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Common stock, no par value (shares)
Common stock, shares authorized (shares)	150,000,000us-gaap_CommonStockSharesAuthorized	150,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares, issued (shares)	32,422,082us-gaap_CommonStockSharesIssued	32,305,145us-gaap_CommonStockSharesIssued
Common stock, shares, outstanding (shares)	32,422,082us-gaap_CommonStockSharesOutstanding	32,305,145us-gaap_CommonStockSharesOutstanding
Common stock held in trust for savings restoration plan (shares)	66,255us-gaap_CommonStockSharesHeldInEmployeeTrustShares	65,332us-gaap_CommonStockSharesHeldInEmployeeTrustShares

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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Face amount per share of no-par value 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 stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned.

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

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