Shareholders' Equity (Details) - $ / shares	1 Months Ended			3 Months Ended
	Oct. 28, 2016	Sep. 30, 2016	Oct. 31, 2015	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Shareholders' Equity
Dividend declared (in dollars per share)		$ 0.48		$ 0.375	$ 0.375	$ 0.375	$ 0.375	$ 0.30	$ 0.30	$ 0.30
Common stock, dividends, per share, cash paid (in usd per share)				$ 0.375	0.375			$ 0.30	0.30
Common stock, dividend declared prior quarter paid current quarter (in usd per share)			$ 0.375		$ 0.375				$ 0.30
Subsequent Event
Shareholders' Equity
Common stock, dividend declared prior quarter paid current quarter (in usd per share)	$ 0.48