Subsequent Events - Equity (Details) - $ / shares	1 Months Ended													3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jun. 30, 2017	May 31, 2017	Apr. 30, 2017	Mar. 31, 2017	Feb. 28, 2017	Jan. 31, 2017	Jun. 30, 2016	May 31, 2016	Apr. 30, 2016	Mar. 31, 2016	Feb. 29, 2016	Jan. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Equity
Dividends per share declared (in dollars per share)		$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.57	$ 0.54	$ 1.14	$ 1.08
Dividend Payable, July 31, 2017 | Subsequent Event | Common Stock
Equity
Dividends per share declared (in dollars per share)	$ 0.19
Dividend Payable, August 31, 2017 | Subsequent Event | Common Stock
Equity
Dividends per share declared (in dollars per share)	0.19
Dividend Payable, September 29, 2017 | Subsequent Event | Common Stock
Equity
Dividends per share declared (in dollars per share)	$ 0.19