Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2016

Class of Stock [Line Items]

Schedule of Common Shares Issued

The table below presents information with respect to shares of the Company’s common stock issued through underwritten public offerings during the three years ended December 31, 2016 (amounts in thousands):

Share Issue Date	Shares Issued	Net Proceeds(1)
November 26, 2014	14,410	$	110,784
April 7, 2014	14,950	$	109,916
January 10, 2014	11,500	$	75,846

⁽¹⁾  Proceeds are net of underwriting costs and offering expenses paid by the Company.

Preferred Stock

Class of Stock [Line Items]

Schedule of Dividends Payable

The following table presents the relevant dates with respect to such quarterly cash dividends on the Series B Preferred Stock commencing January 1, 2014 through December 31, 2016 and Series C Preferred Stock from its respective time of original issuance through December 31, 2016:

Series B Preferred Stock					Series C Preferred Stock
Declaration Date	Record Date	Payment Date	Cash Dividend Per Share		Declaration Date	Record Date	Payment Date	Cash Dividend Per Share
December 15, 2016	January 1, 2017	January 15, 2017	$	0.484375	December 15, 2016	January 1, 2017	January 15, 2017	$	0.4921875
September 15, 2016	October 1, 2016	October 15, 2016	0.484375		September 15, 2016	October 1, 2016	October 15, 2016	0.4921875
June 16, 2016	July 1, 2016	July 15, 2016	0.484375		June 16, 2016	July 1, 2016	July 15, 2016	0.4921875
March 18, 2016	April 1, 2016	April 15, 2016	0.484375		March 18, 2016	April 1, 2016	April 15, 2016	0.4921875
December 16, 2015	January 1, 2016	January 15, 2016	0.484375		December 16, 2015	January 1, 2016	January 15, 2016	0.4921875
September 18, 2015	October 1, 2015	October 15, 2015	0.484375		September 18, 2015	October 1, 2015	October 15, 2015	0.4921875
June 18, 2015	July 1, 2015	July 15, 2015	0.484375		June 18, 2015	July 1, 2015	July 15, 2015	0.4539100		(1)
March 18, 2015	April 1, 2015	April 15, 2015	0.484375		—	—	—	—
December 12, 2014	January 1, 2015	January 15, 2015	0.484375		—	—	—	—
September 18, 2014	October 1, 2014	October 15, 2014	0.484375		—	—	—	—
June 18, 2014	July 1, 2014	July 15, 2014	0.484375		—	—	—	—
March 13, 2014	April 1, 2014	April 15, 2014	0.484375		—	—	—	—

(1) Cash dividend for the partial quarterly period that began on April 22, 2015 and ended on July 14, 2015.

Common Stock

Class of Stock [Line Items]

Schedule of Dividends Payable

The following table presents cash dividends declared by the Company on its common stock with respect to each of the quarterly periods commencing January 1, 2014 and ended December 31, 2016:

Period	Declaration Date	Record Date	Payment Date	Cash Dividend Per Share
Fourth Quarter 2016	December 15, 2016	December 27, 2016	January 26, 2017	$	0.24
Third Quarter 2016	September 15, 2016	September 26, 2016	October 28, 2016	0.24
Second Quarter 2016	June 16, 2016	June 27, 2016	July 25, 2016	0.24
First Quarter 2016	March 18, 2016	March 28, 2016	April 25, 2016	0.24
Fourth Quarter 2015	December 16, 2015	December 28, 2015	January 25, 2016	0.24
Third Quarter 2015	September 18, 2015	September 28, 2015	October 26, 2015	0.24
Second Quarter 2015	June 18, 2015	June 29, 2015	July 27, 2015	0.27
First Quarter 2015	March 18, 2015	March 30, 2015	April 27, 2015	0.27
Fourth Quarter 2014	December 12, 2014	December 22, 2014	January 26, 2015	0.27
Third Quarter 2014	September 18, 2014	September 29, 2014	October 27, 2014	0.27
Second Quarter 2014	June 18, 2014	June 30, 2014	July 25, 2014	0.27
First Quarter 2014	March 13, 2014	March 24, 2014	April 25, 2014	0.27