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Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Statement Of Financial Position [Abstract]
Common stock, par value	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized	160,000,000us-gaap_CommonStockSharesAuthorized	80,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	69,062,394us-gaap_CommonStockSharesIssued	62,243,892us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	69,062,394us-gaap_CommonStockSharesOutstanding	62,243,892us-gaap_CommonStockSharesOutstanding

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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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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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