Equity - Distributions(Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Dividends Payable
Common Stock, Dividends, Per Share, Cash Paid	$ 3.9038	$ 3.8115	$ 3.7150
Ordinary income
Dividends Payable
Common Stock, Dividends, Per Share, Cash Paid	3.3075	3.5497	3.6566
Return of capital
Dividends Payable
Common Stock, Dividends, Per Share, Cash Paid	$ 0.5963	$ 0.2618	$ 0.0584