Subsequent Events - Common Stock Dividend (Details) - $ / shares		3 Months Ended						12 Months Ended
	Feb. 22, 2017	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
Subsequent Event [Line Items]
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
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