FOREIGN EXCHANGE (Tables)

12 Months Ended

Dec. 31, 2018

Effect Of Changes In Foreign Exchange Rates [Abstract]

Disclosure of effect of changes in foreign exchange rate on profit (loss)

($000s)	2018			2017
Unrealized gain (loss) on foreign exchange	(18,617		)	22,165
Unrealized gain (loss) on foreign exchange contracts	3,422			(3,867		)
Total Unrealized gain (loss) on foreign exchange	$	(15,195	)	$	18,298
Realized gain (loss) on foreign exchange	$	(8,296	)	$	(797	)
Gain (loss) on foreign exchange	$	(23,491	)	$	17,501