EMPLOYEE BENEFIT PLANS - Additional Information (Details) - Defined Benefit Pension Plan $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($) plan
Defined Benefit Plan Disclosure [Line Items]
Number of defined benefit pension plans | plan	2
Weighted-average of expected returns on asset investment, percentage	4.50%
Expected contributions for current year | $	$ 4.1
Total contributions to date | $	$ 3.4
Equities
Defined Benefit Plan Disclosure [Line Items]
Weighted-average of expected returns on asset investment, percentage	5.80%
Debt Security
Defined Benefit Plan Disclosure [Line Items]
Weighted-average of expected returns on asset investment, percentage	1.80%
United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Number of defined benefit pension plans | plan	1
Norway
Defined Benefit Plan Disclosure [Line Items]
Subsidiary's percentage of total defined benefit pension plans	1.00%