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Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2018	Dec. 31, 2017
Preferred stock
Preferred stock, par value	$ .01	$ .01
Preferred stock, shares authorized	10,000,000	10,000,000
Common stock
Common stock, par value	$ .01	$ .01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	58,381,952	58,434,566
Common stock, shares outstanding	58,381,952	58,434,566

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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 amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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