SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2013	Jun. 30, 2012
Weighted average assumptions used to determine the benefit obligation and net benefit cost
Discount rate, to determine net benefit cost (as a percent)					3.25%	3.90%
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	$ 22,014	$ 22,377	$ 20,125	$ 20,230	$ 22,377	$ 20,230
Service cost	246	169	230	230
Interest cost	173	173	190	190
Payments		(705)	(180)	(525)
Net benefit cost accrued at the end of the period	$ 22,433	$ 22,014	$ 20,365	$ 20,125	$ 22,433	$ 20,365