CONSLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (PARENTHETICAL) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]
Common stock, cash dividends per share (in dollars per share)			$ 0.08
Treasury shares (in shares)	60,762	88,320	73,206