Subsequent Events - Common Stock Dividend (Details) - $ / shares			3 Months Ended		6 Months Ended
	Aug. 02, 2017	May 03, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Subsequent Event [Line Items]
Quarterly dividend of common stock declared (in dollars per share)		$ 0.1375	$ 0.14	$ 0.14	$ 0.28	$ 0.28
Annualized dividend rate (in dollars per share)		$ 0.55
Subsequent Event [Member]
Subsequent Event [Line Items]
Quarterly dividend of common stock declared (in dollars per share)	$ 0.1375
Annualized dividend rate (in dollars per share)	$ 0.55