EMPLOYEE BENEFIT PLANS Benefit Obligations, Plan Assets, and Funded Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]
Defined Benefit Plan, Actuarial Gain (Loss)	$ (6,208)	$ 7,448	$ (9,917)
Accumulated Benefit Obligation (ABO) at December 31	67,614	70,594
PBO at beginning of year	106,325	96,860
Service cost	4,537	3,610	4,082
Interest cost	4,012	4,600	4,556
Defined Benefit Plan, Amortization of Gains (Losses)	(15)	(55)	0
Participant contributions	$ 735	$ 857
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block]	-6687	12791
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	$ 15	$ 55	0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	(6,193)	7,503	(9,917)
Benefits paid	(3,986)	(4,125)
PBO at end of year	87,186	106,325	96,860
Plan assets at beginning of year	90,342	87,606
Actual return on plan assets	4,781	11,042
Company contributions	2,366	2,310
Plan assets at end of year	79,185	90,342	$ 87,606
Funded status	(8,001)	(15,983)
Current liabilities	(355)	(422)
Non-current liabilities	(7,646)	(15,561)
Net pension liability at end of year	(8,001)	(15,983)
Net actuarial loss (gain)	(9,021)	(2,828)
Prior service cost	0	0
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	(9,021)	(2,828)
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss)	(17,750)	(8,268)
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets	$ (15,053)	$ (7,348)