Shareholders' Equity (Tables)

3 Months Ended

Mar. 31, 2016

The Company has 2,300,000 shares of its 8.50% Series A Preferred Stock and 2,250,000 shares of its 7.625% Series B Preferred Stock issued and outstanding as of March 31, 2016 (collectively, the "Preferred Stock"). The Preferred Stock has no maturity and will remain outstanding indefinitely unless redeemed or otherwise repurchased or converted into common stock pursuant to the terms of the Preferred Stock. Except under certain limited circumstances intended to preserve the Company's REIT status, upon the occurrence of a change in control as defined in Article IIIA, Section 7(d) of the Company’s Articles of Incorporation, or to avoid the direct or indirect imposition of a penalty tax in respect of, or to protect the tax status of, any of the Company’s real estate mortgage investment conduits (“REMIC”) interests or a REMIC in which the Company may acquire an interest (as permitted by the Company’s Articles of Incorporation), the Company may not redeem the Series A Preferred Stock prior to July 31, 2017 or the Series B Preferred Stock prior to April 30, 2018. On or after these dates, at any time and from time to time, the Preferred Stock may be redeemed in whole, or in part, at the Company's option at a cash redemption price of $25.00 per share plus any accumulated and unpaid dividends. The Series A Preferred Stock pays a cumulative cash dividend equivalent to 8.50% of the $25.00 liquidation preference per share each year and the Series B Preferred Stock pays a cumulative cash dividend equivalent to 7.625% of the $25.00 liquidation preference per share each year. Because the Preferred Stock is redeemable only at the option of the issuer, it is classified as equity on the Company's consolidated balance sheet. The Company announced that it will pay its regular quarterly dividends on its Preferred Stock for the first quarter on April 15, 2016 to shareholders of record as of April 1, 2016.

Schedule of Common Stock Outstanding Roll Forward [Table Text Block]

The following table presents a summary of the changes in the number of common shares outstanding for the periods presented:



	Three Months Ended
	March 31,
	2016		2015
Balance as of beginning of period	49,047,335		54,739,111
Common stock issued under DRIP	9,074		4,744
Common stock issued under stock and incentive plans	168,720		231,274
Common stock forfeited for tax withholding on share-based compensation	(80,888	)	(65,913	)
Common stock repurchased during the period	(48,444	)	(16,140	)
Balance as of end of period	49,095,797		54,893,076

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

The following table presents a rollforward of the restricted stock activity for the periods indicated:



	Three Months Ended
	March 31,
	2016		2015
Restricted stock outstanding as of beginning of period	696,597		731,809
Restricted stock granted	168,720		231,274
Restricted stock vested	(317,831	)	(266,264	)
Restricted stock outstanding as of end of period	547,486		696,819