RETIREMENT BENEFITS PLANS (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Unrecognized net actuarial gain included in accumulated other comprehensive income	$ 400,000
Accumulated benefit obligation	42,900,000
Fair value of plan assets	26,943,000	$ 0
Plan assets expected to be returned next twelve months	0
Contributions expected to be paid to plan in 2018	1,800,000
Employer contributions	450,000		$ 1,800,000
Selling, general and administrative expenses recorded in conjunction with the buy-out of the plan			5,600,000
Total contributions made	7,200,000	$ 5,600,000	$ 3,700,000
AUSTRIA | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
FRANCE | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
GERMANY | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0