EMPLOYEE BENEFIT PLANS (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plans
Employer's contribution	$ 5,900,000	$ 4,300,000	$ 3,500,000
Supplemental Executive Retirement Plan (SERP)
Defined Benefit Plans
Benefits accrued	583,000	644,000	787,000
Surrender value related to life insurance contracts	$ 31,400,000	$ 45,500,000