Shareholders' Equity Cash Dividends Declared Per Common Share (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Equity [Abstract]
Cash dividends declared and paid per common share (in dollars per share)	$ 0.53	$ 0.48	$ 1.59	$ 1.44