Stockholders' Equity (Schedule of Dividend Increases) (Details) - $ / shares	1 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2014
Schedule of Dividend Increases [Line Items]
Percent increase in common stock dividend	20.00%	20.00%	39.00%
Common Stock, Dividends, Per Share, Board Increase Announcement, Quarterly	$ 0.36	$ 0.30	$ 0.25
Common stock, Dividends, Per Share, Board Increase Announcement, Annual	$ 1.44	$ 1.20	$ 1.00