CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Statement of Stockholders' Equity [Abstract]
Issuance of common shares under stock based compensation awards	60,459	104,853
Common stock acquired for treasury	900	269,667
Common stock dividend (in dollars per share)	$ 0.37	$ 0.36