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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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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- Definition

Number of new stock issued during the period.

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- Definition

Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

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Convertible Preferred Stock (Details) (USD $)	12 Months Ended		1 Months Ended			0 Months Ended
Convertible Preferred Stock (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	May 31, 2012 Series A Preferred Stock [Member]	Dec. 31, 2012 Series A Preferred Stock [Member]	Dec. 31, 2011 Series A Preferred Stock [Member]	Jul. 24, 2012 Series B Preferred Stock [Member]	Dec. 31, 2012 Series B Preferred Stock [Member]	Dec. 31, 2011 Series B Preferred Stock [Member]
Class of Stock [Line Items]
Shares Issued (in shares)			545,454			283,018
Proceeds from Issuance of stock	$ 1,657,807,000	$ 186,127,000	$ 6,000,000			$ 3,000,000
Proceeds from Issuance of stock, net			5,800,000			3,000,000
Liquidation Preference Per Share			$ 11.00	$ 11.00	$ 11.00	$ 10.60	$ 10.60	$ 10.60
Redemption Premium			$ 0.01			$ 0.01
Annualized rate of dividend (per share)			$ 0.77			$ 0.74
Redemption price per share			$ 11.00			$ 10.60