CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Treasury stock, shares	262,070us-gaap_TreasuryStockShares	233,063us-gaap_TreasuryStockShares
Common stock, shares issued	71,568,936us-gaap_CommonStockSharesIssued	65,306,748us-gaap_CommonStockSharesIssued
Common stock, shares authorized	128,000,000us-gaap_CommonStockSharesAuthorized	128,000,000us-gaap_CommonStockSharesAuthorized
Common stock, par value	$ 0.01	$ 0.01
Preferred stock liquidation preference (in dollars per share)	$ 10,000	$ 10,000
Preferred stock, shares authorized	100,000us-gaap_PreferredStockSharesAuthorized	100,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, par value	$ 100	$ 100
Series A Preferred Stock
Preferred stock, shares issued	7,945	11,500
Series B Preferred Stock
Preferred stock, shares issued	32,500	0

Face amount or stated value per share of common stock.

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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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The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

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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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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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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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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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