Income Taxes (Details 3) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Series A Preferred Stock [Member]
Income Taxes [Line Items]
Capital Gains (in dollars per share)	$ 0	$ 1.23	$ 0
Capital Gains, Percent	0.00%	63.08%	0.00%
Dividend income (in dollars per share)	$ 1.03	$ 0.72	$ 0
Dividend income, percent	52.82%	36.92%	0.00%
Income Taxes, Cash Dividends Distributed Attributable to Non-Dividend Distribution	$ 0.92	$ 0.00	$ 1.95
Income Taxes, Cash Dividends Distributed Attributable to Non-Dividend Distribution, Percent	47.18%	0.00%	100.00%
Dividends paid (in dollars per share)	$ 1.95000	$ 1.95000	$ 1.95000
Dividends paid, percent	100.00%	100.00%	100.00%
Series C Preferred Stock [Member]
Income Taxes [Line Items]
Capital Gains (in dollars per share)	$ 0	$ 0.63	$ 0
Capital Gains, Percent	0.00%	63.00%	0.00%
Dividend income (in dollars per share)	$ 0	$ 0.37	$ 0
Dividend income, percent	0.00%	37.00%	0.00%
Income Taxes, Cash Dividends Distributed Attributable to Non-Dividend Distribution	$ 0.00	$ 0.00	$ 2.00
Income Taxes, Cash Dividends Distributed Attributable to Non-Dividend Distribution, Percent	0.00%	0.00%	100.00%
Dividends paid (in dollars per share)	$ 0	$ 1.000	$ 2.000
Dividends paid, percent	0.00%	100.00%	100.00%
Common Stock [Member]
Income Taxes [Line Items]
Capital Gains (in dollars per share)	$ 0	$ 0	$ 0
Capital Gains, Percent	0.00%	0.00%	0.00%
Dividend income (in dollars per share)	$ 0	$ 0	$ 0
Dividend income, percent	0.00%	0.00%	0.00%
Income Taxes, Cash Dividends Distributed Attributable to Non-Dividend Distribution	$ 0.24	$ 0.16	$ 0.08
Income Taxes, Cash Dividends Distributed Attributable to Non-Dividend Distribution, Percent	100.00%	100.00%	100.00%
Dividends paid (in dollars per share)	$ 0.24000	$ 0.16000	$ 0.08000
Dividends paid, percent	100.00%	100.00%	100.00%