STOCK-BASED COMPENSATION (Summary of Changes in Nonvested Stock and Weighted-Average Grant Date Fair Value) (Details) - Nonvested Stock - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Shares
Nonvested at the beginning of the year (in shares)	1,431	1,700	1,695
Granted (in shares)	460	472	580
Vested (in shares)	(645)	(698)	(480)
Forfeited (in shares)	(59)	(43)	(95)
Nonvested at the ending of the year (in shares)	1,187	1,431	1,700
Weighted-Average Grant Date Fair Value
Nonvested at the beginning of the year (in dollars per share)	$ 72.64	$ 57.52	$ 46.50
Granted (in dollars per share)	84.07	79.26	70.89
Vested (in dollars per share)	55.28	39.21	35.83
Forfeited (in dollars per share)	73.54	59.05	52.16
Nonvested at the ending of the year (in dollars per share)	$ 87.54	$ 72.64	$ 57.52