Redeemable Preferred Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Dec. 18, 2012
Equity [Abstract]
Preferred stock, redemption amount	$ 147,323	$ 146,547	$ 143,200
Preferred stock, shares issued	0	0	8,955,730
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, redemption price per share			$ 15.99

Face amount or stated value per share of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer); generally not indicative of the fair market value per share.

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The redemption (or callable) amount of currently redeemable preferred stock. Includes amounts representing dividends not currently declared or paid but which will be payable under the redemption features or for which ultimate payment is solely within the control of the issuer.

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- Definition

The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer.

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