CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Stockholders' Equity [Abstract]
Issuance of common shares per stock based compensation awards, including related tax effects, shares	[1]	118,281	91,675	186,936
Common stock acquired for treasury, shares	[1]	338,985	597,747	99,064
Common stock dividend (in dollars per share)	[1]	$ 0.671	$ 0.645	$ 0.618
Cash Paid in Lieu of Fractional Shares		$ 13

[1] *Share and per share data gives retrospective recognition to a 10% stock dividend declared on July 22, 2015 and issued on August 14, 2015.