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Condensed Consolidated Balance Sheets Parenthetical (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Common stock, par value	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized	150,000,000us-gaap_CommonStockSharesAuthorized	150,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	30,539,182us-gaap_CommonStockSharesIssued	30,482,252us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	30,539,182us-gaap_CommonStockSharesOutstanding	30,482,252us-gaap_CommonStockSharesOutstanding
Allowance for Doubtful Accounts Receivable, Current	$ 7,211us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	$ 5,654us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent

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

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- Definition

Face amount or stated value per share of common stock.

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X

- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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- Definition

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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