INCOME TAXES (Additional Information) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Effective income tax rate		(71.60%)	557.50%	59.80%
Net benefit from enacted tax act	$ 93,000
Tax benefit due to reduction in net deferred tax liability	100,500
One-time tax expense on deemed repatriation	7,500
Tax effects		$ (269)	$ 16,918	$ 7
Valuation allowance	68,355	68,355	55,189
Valuation allowance, foreign tax credits	17,500	17,500	25,000
Valuation allowance, federal net operating loss carryforwards	3,900	3,900	1,500
Valuation allowance, state net operating loss carryforwards	11,900	11,900	5,000
Valuation allowance, foreign net operating loss carryforwards	22,600	22,600	18,000
Valuation allowance, deferred tax assets of Canadian subsidiary	12,500	12,500	5,700
Unrecognized tax benefits that would impact effective tax rate	5,100	5,100	1,700	2,100
Unrecognized tax benefits, income tax penalties and interest accrued	$ 900	900	300	400
Unrecognized tax benefits, penalties and interest		500	100	100
Reduction in unrecognized tax benefit from the expiration of statue of limitations and the resolution of tax audits		1,400
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Tax effects		$ 0	$ 16,761	$ 0