Summary of Significant Accounting Policies (Subsequent Events) (Details) - $ / shares		3 Months Ended								12 Months Ended
	Jan. 17, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Subsequent Event [Line Items]
Cash dividends declared on common stock (in dollars per share)		$ 0.20	$ 0.10	$ 0.10	$ 0.10	$ 0.15	$ 0.10	$ 0.10	$ 0.10	$ 0.50	$ 0.45	$ 0.40
Subsequent Event
Subsequent Event [Line Items]
Percentage increase in regular quarterly cash dividend	10.00%
Cash dividends declared on common stock (in dollars per share)	$ 0.11