Consolidated Statements of Stockholders' Equity (unaudited) (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Consolidated Statements of Stockholders' Equity (unaudited) [Abstract]
Cash dividends - per share (in dollars per share)	$ 0.43	$ 0.42
Purchase of treasury shares (in shares)	433,351	3,288
Net issuance of shares to employee benefit plans and other stock plans, including tax benefit (in shares)	222,326	189,036