SHAREHOLDERS' EQUITY (Details) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of year (in shares)	12,893,794	12,838,227	12,821,768
Shares distributed/exercised (in shares)	80,908	101,759	36,464
Shares purchased (in shares)	(4,688)	(45,776)	(18,605)
Shares forfeited (in shares)	(6,850)	(416)	(1,400)
Balance at end of year (in shares)	12,963,164	12,893,794	12,838,227