CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Statement of Stockholders' Equity [Abstract]
Cash dividends (in dollars per share)	$ 0.34	$ 0.28
Common stock (purchased) sold by directors' deferred compensation plan (in net shares)	10,620	5,000
Shares of common stock repurchased	362,371	233,722