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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized (in shares)	250,000,000us-gaap_CommonStockSharesAuthorized	250,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued (in shares)	158,492,995us-gaap_CommonStockSharesIssued	158,201,996us-gaap_CommonStockSharesIssued
Common Stock, shares outstanding (in shares)	158,492,995us-gaap_CommonStockSharesOutstanding	158,201,996us-gaap_CommonStockSharesOutstanding

X

- Definition

Face amount or stated value per share of common stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.5-02.29)



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-Section 02



-Paragraph 30



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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



-Paragraph 1



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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682







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X

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.5-02.29)



-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682







Reference 2: http://www.xbrl.org/2003/role/presentationRef



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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 04



-Article 3







Reference 2: http://www.xbrl.org/2003/role/presentationRef



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-Name Accounting Standards Codification



-Topic 505



-SubTopic 10



-Section 50



-Paragraph 2



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Reference 3: http://www.xbrl.org/2003/role/presentationRef



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-Name Accounting Standards Codification



-Topic 505



-SubTopic 10



-Section S99



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Reference 4: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



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-Section S99



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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682







Reference 5: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



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