Shareholders' Equity (Tables)

6 Months Ended

Jun. 30, 2015

Equity [Abstract]

Preferred Stock [Text Block]

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 June 30, 2015 (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.

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:

	Six Months Ended
	June 30,
	2015		2014
Balance as of beginning of period	54,739,111		54,310,484
Common stock issued under DRIP	9,688		6,543
Common stock issued under stock and incentive plans	263,829		471,210
Common stock forfeited for tax withholding on share-based compensation	(67,296	)	(59,150	)
Common stock repurchased during the period	(860,721	)	—
Balance as of end of period	54,084,611		54,729,087

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				Six Months Ended
	June 30,				June 30,
	2015		2014 (1)		2015		2014 (1)
Restricted stock outstanding as of beginning of period	696,819		723,964		731,809		520,987
Restricted stock granted	32,555		29,175		263,829		457,538
Restricted stock vested	(32,777	)	(17,916	)	(299,041	)	(243,302	)
Restricted stock outstanding as of end of period	696,597		735,223		696,597		735,223