SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Capital in excess of par value	$ 483,560		$ 498,702
Less treasury stock at cost	(318,063)		(1,026,117)
Stock option exercises & restricted stock vestings	64,717	$ 45,115
Total Stockholders' Equity	1,159,904	1,410,878	1,103,916	$ 1,480,308
Capital in Excess of Par Value
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stock option exercises & restricted stock vestings	60,771	43,287
Total Stockholders' Equity	483,560	531,579	498,702	488,292
Treasury Stock
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stock option exercises & restricted stock vestings	3,936	1,822
Total Stockholders' Equity	$ (318,063)	(827,253)	(1,026,117)	(738,558)
Reissuance of incorrectly accounted treasury shares | As previously reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Capital in excess of par value			507,313
Less treasury stock at cost			(1,034,728)
Stock option exercises & restricted stock vestings		45,115
Total Stockholders' Equity		1,410,878	1,103,916	1,480,308
Reissuance of incorrectly accounted treasury shares | As previously reported | Capital in Excess of Par Value
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stock option exercises & restricted stock vestings		45,108
Total Stockholders' Equity		539,055		493,947
Reissuance of incorrectly accounted treasury shares | As previously reported | Treasury Stock
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stock option exercises & restricted stock vestings		1
Total Stockholders' Equity		(834,729)		(744,213)
Reissuance of incorrectly accounted treasury shares | Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Capital in excess of par value			(8,611)
Less treasury stock at cost			$ 8,611
Reissuance of incorrectly accounted treasury shares | Adjustment | Capital in Excess of Par Value
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stock option exercises & restricted stock vestings		(1,821)
Total Stockholders' Equity		(7,476)		(5,655)
Reissuance of incorrectly accounted treasury shares | Adjustment | Treasury Stock
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stock option exercises & restricted stock vestings		1,821
Total Stockholders' Equity		$ 7,476		$ 5,655