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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Statement Of Financial Position [Abstract]
Trade accounts receivable, allowance for doubtful accounts	$ 6,831us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	$ 7,285us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Common shares, par value	$ 0.10us-gaap_CommonStockParOrStatedValuePerShare	$ 0.10us-gaap_CommonStockParOrStatedValuePerShare
Common shares, authorized	50,000,000us-gaap_CommonStockSharesAuthorized	50,000,000us-gaap_CommonStockSharesAuthorized
Common shares, issued	18,757,361us-gaap_CommonStockSharesIssued	18,611,495us-gaap_CommonStockSharesIssued
Common shares, outstanding	18,757,361us-gaap_CommonStockSharesOutstanding	18,611,495us-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 SEC

-Name Regulation S-X (SX)

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-Name Accounting Standards Codification

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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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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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