Stockholders' Equity (Cash Dividends Paid) (Details) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($) $ / shares
Dividends Payable [Line Items]
Total dividend paid, Common Stock	$ 2,560
Total dividend paid, Preferred Stock	$ 3,916
Declaration Date, January 7, 2015 [Member]
Dividends Payable [Line Items]
Declaration Date	Jan. 07, 2015
Record Date	Feb. 19, 2015
Payment Date	Mar. 04, 2015
Per Share Amount (in dollars per share) | $ / shares	$ 0.25
Total dividend paid, Common Stock	$ 1,828
Declaration Date, April 29, 2015 [Member]
Dividends Payable [Line Items]
Declaration Date	Apr. 29, 2015
Record Date	May 15, 2015
Payment Date	Jun. 03, 2015
Per Share Amount (in dollars per share) | $ / shares	$ 0.05
Total dividend paid, Common Stock	$ 366
Declaration Date, July 30, 2015 [Member]
Dividends Payable [Line Items]
Declaration Date	Jul. 30, 2015
Record Date	Aug. 14, 2015
Payment Date	Sep. 04, 2015
Per Share Amount (in dollars per share) | $ / shares	$ 0.05
Total dividend paid, Common Stock	$ 366
9.50% Series A Preferred Stock [Member] | Declaration Date, January 7, 2015 [Member]
Dividends Payable [Line Items]
Declaration Date	Jan. 07, 2015
Record Date	Jan. 29, 2015
Payment Date	Jan. 30, 2015
Per Share Amount (in dollars per share) | $ / shares	$ 2.375
Total dividend paid, Preferred Stock	$ 594
9.50% Series A Preferred Stock [Member] | Declaration Date, April 2, 2015 [Member]
Dividends Payable [Line Items]
Declaration Date	Apr. 02, 2015
Record Date	Apr. 29, 2015
Payment Date	Apr. 30, 2015
Per Share Amount (in dollars per share) | $ / shares	$ 2.375
Total dividend paid, Preferred Stock	$ 594
9.50% Series A Preferred Stock [Member] | Declaration Date, July 8, 2015 [Member]
Dividends Payable [Line Items]
Declaration Date	Jul. 08, 2015
Record Date	Jul. 29, 2015
Payment Date	Jul. 30, 2015
Per Share Amount (in dollars per share) | $ / shares	$ 2.375
Total dividend paid, Preferred Stock	$ 594
9.00% Series B Preferred Stock [Member] | Declaration Date, January 7, 2015 [Member]
Dividends Payable [Line Items]
Declaration Date	Jan. 07, 2015
Record Date	Jan. 29, 2015
Payment Date	Jan. 30, 2015
Per Share Amount (in dollars per share) | $ / shares	$ 2.250
Total dividend paid, Preferred Stock	$ 711
9.00% Series B Preferred Stock [Member] | Declaration Date, April 2, 2015 [Member]
Dividends Payable [Line Items]
Declaration Date	Apr. 02, 2015
Record Date	Apr. 29, 2015
Payment Date	Apr. 30, 2015
Per Share Amount (in dollars per share) | $ / shares	$ 2.250
Total dividend paid, Preferred Stock	$ 712
9.00% Series B Preferred Stock [Member] | Declaration Date, July 8, 2015 [Member]
Dividends Payable [Line Items]
Declaration Date	Jul. 08, 2015
Record Date	Jul. 29, 2015
Payment Date	Jul. 30, 2015
Per Share Amount (in dollars per share) | $ / shares	$ 2.250
Total dividend paid, Preferred Stock	$ 711