Equity - Common Stock Dividends (Details) - $ / shares	3 Months Ended						12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Equity [Abstract]
Quarterly dividend of common stock declared (in dollars per share)	$ 0.1375	$ 0.1375	$ 0.1375	$ 0.1375	$ 0.1375	$ 0.1375	$ 0.55	$ 0.28	$ 1.03000
Annualized dividend rate (in dollars per share)	$ 0.55	$ 0.55					$ 0.55
Ordinary dividends							95.00%	75.90%	6.00%
Nontaxable distributions							0.00%	0.00%	94.00%
Capital gain distributions							5.00%	24.10%	0.00%
Total							100.00%	100.00%	100.00%