SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Pretax Compensation Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Pretax compensation expense	$ 16,362	$ 22,217	$ 20,187
Income tax benefits	$ 6,347	$ 8,571	$ 7,833