Financing Activities - Distributions (Details) - $ / shares	1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 31, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Distributions (Numeric) [Abstract]
Quarterly common stock dividend declaration date	2016-08
Dividend payable date of quarterly common stock dividend	Oct. 03, 2016
Current quarterly common stock dividend (in dollars per share)	$ 0.38	$ 0.38	$ 0.3775	$ 1.14	$ 1.1225
Annualized current quarterly common stock dividend (in dollars per share)	$ 1.52