STOCK-BASED COMPENSATION Option Activity (Details) - Stock Options $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) $ / shares shares
Option activity under the Plans
Outstanding at January 1, 2016 | shares	1,030
Granted | shares	0
Exercised | shares	(24)
Forfeited or expired | shares	0
Outstanding at March 31, 2016 | shares	1,006
Exercisable at March 31, 2016 | shares	1,002
Vested and expected to vest at March 31, 2016 | shares	1,006
Weighted- Average Exercise Price (in dollars per share)
Outstanding at January 1, 2016 | $ / shares	$ 27.58
Granted | $ / shares	0.00
Exercised | $ / shares	24.14
Forfeited or expired | $ / shares	0.00
Outstanding at March 31, 2016 | $ / shares	27.66
Exercisable at March 31, 2016 | $ / shares	27.60
Vested and expected to vest at March 31, 2016 | $ / shares	$ 27.66
Weighted-Average Remaining Contractual Term (in years)
Outstanding, weighted-average remaining contractual term at period end	2 years 11 months 28 days
Exercisable, weighted-average remaining contractual term, at period-end	2 years 11 months 22 days
Vested and expected to vest, weighted-average remaining contractual term, at period end	2 years 11 months 28 days
Aggregate Intrinsic Value [Abstract]
Outstanding, aggregate intrinsic value at period end | $	$ 22,141
Exercisable, aggregate intrinsic value, at period end | $	22,112
Vested and expected to vest, aggregate intrinsic value, at Period-end | $	$ 22,141