STOCK-BASED COMPENSATION Option Activity (Details) - Stock Options $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($) $ / shares shares
Option activity under the Plans
Outstanding at January 1, 2016 | shares	1,030
Granted | shares	0
Exercised | shares	(44)
Forfeited or expired | shares	0
Outstanding at June 30, 2016 | shares	986
Exercisable at June 30, 2016 | shares	986
Vested and expected to vest at June 30, 2016 | shares	986
Weighted- Average Exercise Price (in dollars per share)
Outstanding at January 1, 2016 | $ / shares	$ 27.58
Granted | $ / shares	0.00
Exercised | $ / shares	23.31
Forfeited or expired | $ / shares	0.00
Outstanding at June 30, 2016 | $ / shares	27.77
Exercisable at June 30, 2016 | $ / shares	27.77
Vested and expected to vest at June 30, 2016 | $ / shares	$ 27.77
Weighted-Average Remaining Contractual Term (in years)
Outstanding, weighted-average remaining contractual term at period end	2 years 9 months 5 days
Exercisable, weighted-average remaining contractual term, at period-end	2 years 9 months 5 days
Vested and expected to vest, weighted-average remaining contractual term, at period end	2 years 9 months 5 days
Aggregate Intrinsic Value [Abstract]
Outstanding, aggregate intrinsic value at period end | $	$ 21,911
Exercisable, aggregate intrinsic value, at period end | $	21,911
Vested and expected to vest, aggregate intrinsic value, at Period-end | $	$ 21,911