SHAREHOLDERS' EQUITY (Treasury Shares) (Details) - Common stocks - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Treasury Shares [Line Items]
Total shares (in shares)	7	26	164	175
Total cost	$ 411	$ 1,512	$ 9,414	$ 8,676
Average price per share (in usd per share)	$ 58.34	$ 57.97	$ 57.22	$ 49.56
In the Open Market
Treasury Shares [Line Items]
Total shares (in shares)	0	0	0	0
Total cost	$ 0	$ 0	$ 0	$ 0
Average price per share (in usd per share)	$ 0	$ 0	$ 0	$ 0
From Employees
Treasury Shares [Line Items]
Total shares (in shares)	7	26	164	175
Total cost	$ 411	$ 1,512	$ 9,414	$ 8,676
Average price per share (in usd per share)	$ 58.34	$ 57.97	$ 57.22	$ 49.56