STOCK-BASED COMPENSATION Option Activity (Details) - Stock Options $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($) $ / shares shares
Option activity under the Plans
Outstanding at January 1, 2016 | shares	1,030
Granted | shares	0
Exercised | shares	(168)
Forfeited or expired | shares	0
Outstanding at September 30, 2016 | shares	862
Exercisable at September 30, 2016 | shares	862
Vested and expected to vest at September 30, 2016 | shares	862
Weighted- Average Exercise Price (in dollars per share)
Outstanding at January 1, 2016 | $ / shares	$ 27.58
Granted | $ / shares	0.00
Exercised | $ / shares	24.83
Forfeited or expired | $ / shares	0.00
Outstanding at September 30, 2016 | $ / shares	28.12
Exercisable at September 30, 2016 | $ / shares	28.12
Vested and expected to vest at September 30, 2016 | $ / shares	$ 28.12
Weighted-Average Remaining Contractual Term (in years)
Outstanding, weighted-average remaining contractual term at period end	2 years 8 months 20 days
Exercisable, weighted-average remaining contractual term, at period-end	2 years 8 months 20 days
Vested and expected to vest, weighted-average remaining contractual term, at period end	2 years 8 months 20 days
Aggregate Intrinsic Value [Abstract]
Outstanding, aggregate intrinsic value at period end | $	$ 30,106
Exercisable, aggregate intrinsic value, at period end | $	30,106
Vested and expected to vest, aggregate intrinsic value, at Period-end | $	$ 30,106