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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Revision of Prior Period Financial Statements) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Retirement and deferred compensation plan liabilities $ (41,004) $ (9,380) $ (30,332)
Net Cash Provided by Operations 324,729 325,299 323,759
Proceeds from stock option exercises 73,905 55,347 64,759
Net Cash Provided (Used) by Financing Activities $ 114,792 (29,715) (32,310)
As Previously Reported      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Retirement and deferred compensation plan liabilities   (7,486) (29,576)
Net Cash Provided by Operations   327,193 324,515
Proceeds from stock option exercises   53,453 64,003
Net Cash Provided (Used) by Financing Activities   (31,609) (33,066)
Adjustment      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Retirement and deferred compensation plan liabilities   (1,894) (756)
Net Cash Provided by Operations   (1,894) (756)
Proceeds from stock option exercises   1,894 756
Net Cash Provided (Used) by Financing Activities   $ 1,894 $ 756