RETIREMENT AND POSTRETIREMENT BENEFIT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017		Mar. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 734		$ 4,430
Interest cost	5,532		6,011
Expected return on plan assets	(8,615)		(8,864)
Amortization of prior service cost	4		(99)
Amortization of net loss	1,000		2,666
Defined benefit plans	(1,345)		4,144
Multi-employer plans	193		202
Defined contribution plans	6,764		1,969
Total pension cost	$ 5,612	[1]	$ 6,315

[1] (1) The decrease for the three months ended March 31, 2017 as compared to the prior year period reflects lower service cost and lower amortization of net losses related to the defined benefit plan freeze effective December 31, 2016, partially offset by higher defined contribution plan expense related to the Company's amended U.S. defined contribution plan that was effective January 1, 2017.