PENSION PLANS (Tables)

12 Months Ended

Dec. 31, 2015

Pension and Other Postretirement Benefit Expense [Abstract]

Schedule of Aggregate Net Pension Expense

The aggregate net pension expense relating to these three plans are as follows:

	Years Ended
	December 31, 2015			December 31, 2014		December 31, 2013
	(in thousands)
Service costs	$	1,352		$	1,526	$	1,795
Interest costs	1,394			1,509		1,430
Amortization of actuarial loss	772			47		376
Settlement and other related gain	—			—		(59		)
Curtailment gain	(1,699		)	—		(1,607		)
Net pension period cost	$	1,819		$	3,082	$	1,935

Schedule of Changes in Projected Benefit Obligation and Accumulated Benefit Obligation

The change in projected benefit obligation and the accumulated benefit obligation, were as follows:

	December 31, 2015			December 31, 2014
	(in thousands)
Projected benefit obligation at beginning of the year	$	49,836		$	38,916
Service costs	1,352			1,526
Interest costs	1,394			1,509
Curtailment gain	(1,699		)	—
Actuarial (gains) losses	(3,354		)	8,753
Benefits paid	(705		)	(483		)
Foreign currency exchange rate changes	(7,225		)	(385		)
Projected benefit obligation at end of the year	$	39,599		$	49,836
Accumulated benefit obligation at end of the year	35,470			46,092

Schedule of Actuarial Assumptions Used to Determine Benefit Obligations

Actuarial assumptions used to determine benefit obligations for the plans were as follows:

	Years Ended
	December 31, 2015	December 31, 2014	December 31, 2013
Assumed discount rate	1.93%-2.57%	1.49-2.15%	3.1-4.0%
Assumed compensation rate of increase	2.9%-3.0%	2.9-3.0%	2.4-3.0%

Schedule of Expected Benefit Payments

Future estimated expected benefit payments over the next 10 years are as follows:

Years Ending December 31:
	(in thousands)
2016	$	673
2017	550
2018	847
2019	1,064
2020	1,056
2021 through 2025	8,472
	$	12,662