CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Common stock, par value (in Dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	60,000,000us-gaap_CommonStockSharesAuthorized	60,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	52,859,953us-gaap_CommonStockSharesIssued	52,819,787us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	52,859,953us-gaap_CommonStockSharesOutstanding	52,819,787us-gaap_CommonStockSharesOutstanding
Debt Instrument, Interest Rate, Stated Percentage	3.75%	3.75%
Convertible Notes Payable [Member]
Debt Instrument, Interest Rate, Stated Percentage	3.75%	3.75%
Debt Instrument, Face Amount	$ 143,750	$ 143,750
Series A Preferred Stock [Member]
Preferred Stock, par value (in Dollars per share)	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	100	100
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Series C Preferred Stock [Member]
Preferred Stock, par value (in Dollars per share)	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	1,550	1,550
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0

Face amount or stated value per share of common stock.

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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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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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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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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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