SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash paid during the year for [Abstract]
Income taxes	$ 30,741	$ 19,551	$ 25,304
Interest	6,669	5,987	4,685
Non-cash financing activities [Abstract]
Dividends payable	$ 12,088	$ 10,727	$ 9,251