EMPLOYEE BENEFIT PLANS (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Other changes in plan assets and benefit obligations recognized in accumulated other comprehensive income:
Total adjustments	$ 32,545		$ (1,804)		$ (21,739)
Pension Plan
Components of net periodic benefit cost:
Service cost	2,783		2,682		2,312
Interest cost	3,640		3,246		3,184
Expected return on plan assets	(4,446)		(3,882)		(3,877)
Amortization of net loss	2,653		1,788		537
Net periodic benefit cost	4,630		3,834		2,156
Other changes in plan assets and benefit obligations recognized in accumulated other comprehensive income:
Net actuarial gain (loss)	12,472		(6,524)		(17,483)
Reversal of amortization item, net actuarial loss	2,653	[1]	1,788	[1]	537	[1]
Total adjustments	15,125		(4,736)		(16,946)
Net periodic benefit cost	(4,630)		(3,834)		(2,156)
Total recognized in net periodic benefit cost and accumulated other comprehensive income (loss)	$ 10,495		$ (8,570)

[1] Amortization of actuarial gain or loss is included in the computation of net periodic benefit cost (see Notes 13 and 17 for additional details).