L. SHARE-BASED COMPENSATION - OPTION ACTIVITY (Details) - Employee Stock Option [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Number of Shares
Outstanding, beginning balance	1,310	1,423	1,468
Granted			108
Exercised	(159)	(81)	(104)
Forfeited	(21)	(32)	(48)
Expired			(1)
Outstanding, ending balance	1,130	1,310	1,423
Exericsable, ending balance	877
Vested and expected to vest	1,122
Weighted Average Exercise Price
Outstanding, beginning balance	$ 9.07	$ 8.96	$ 8.38
Granted			13.84
Exercised	6.91	7.09	6.22
Forfeited	7.96	8.96	8.23
Expired			6.21
Outstanding, ending balance	9.40	9.07	8.96
Exericsable, ending balance	9.18
Vested and expected to vest	9.39
Weighted Average Share Price on Date of Exercise	19.90	16.53
Weighted Average Fair Value [Abstract]
Outstanding, beginning balance	4.59	4.48	4.17
Granted			7.24
Exercised	2.56	2.62	2.57
Forfeited	3.29	4.43	5.43
Expired			2.21
Outstanding, ending balance	4.90	$ 4.59	$ 4.48
Exericsable, ending balance	4.78
Vested and expected to vest	$ 4.90
Weighted Average Remaining Contractual Life
Outstanding, ending balance	6 years 4 months 29 days
Exercisable, ending balance	6 years 4 months
Vested and expected to vest	6 years 4 months 28 days
Aggregate Intrinsic Value
Aggregate intrinsic value, beginning balance	$ 10,598	$ 3,486	$ 9,731
Exercised	2,071	762	1,476
Forfeited	273	212	628
Expired			11
Aggregate intrinsic value, ending balance	15,872	$ 10,598	$ 3,486
Exercisable, ending balance	12,499
Vested and expected to vest	$ 15,767