SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN (SERP) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Weighted average assumptions used to determine the benefit obligation and net benefit cost
Discount rate, to determine net benefit cost (as a percent)	4.03%	3.25%
Average rate of increase in compensation, to determine net benefit cost (as a percent)	3.00%	3.00%
Change in Benefit Obligation
Net benefit cost accrued at the beginning of the period	$ 20,952	$ 22,377
Service cost	129	169
Interest cost	199	173
Payments	(1,247)	(705)
Net benefit cost accrued at the end of the period	$ 20,033	$ 22,014