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Consolidated Balance Sheet (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Consolidated Balance Sheet [Abstract]
Allowance for doubtful accounts, Accounts receivable	$ 1,199us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	$ 1,190us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Preferred stock, par value	$ 0.01us-gaap_PreferredStockParOrStatedValuePerShare	$ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized	600,000,000us-gaap_PreferredStockSharesAuthorized	600,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued	0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued
Common stock, par value	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized	230,000,000us-gaap_CommonStockSharesAuthorized	230,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	35,394,000us-gaap_CommonStockSharesIssued	35,245,000us-gaap_CommonStockSharesIssued
Treasury stock, shares at cost	4,367,000us-gaap_TreasuryStockShares	4,212,000us-gaap_TreasuryStockShares

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 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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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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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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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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