CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Statement of Stockholders' Equity [Abstract]
Issuance of common shares under stock based compensation awards, including related tax effects	109,887	117,122
Common stock acquired for treasury	270,378	283,263
Common stock dividend (in dollars per share)	$ 0.540	$ 0.491
Cash Paid in Lieu of Fractional Shares		$ 13