COMMON STOCK (Details) - USD ($)	1 Months Ended	9 Months Ended
	Mar. 31, 2009	Sep. 30, 2017	Dec. 31, 2008
Equity, Class of Treasury Stock [Line Items]
Common stock authorized by the Board of Directors (in shares)	1,200,000		2,250,000
Total purchased shares (in shares)	859,499	0
Additional estimated shares (in shares)		244,100
Closing price (in dollars per share)		$ 61.45
Maximum [Member]
Equity, Class of Treasury Stock [Line Items]
Maximum percentage of repurchase of common stock	10.00%
Bank credit agreement to permit share repurchases of common stock	$ 15,000,000