NET INCOME PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Numerator:
Net income	$ 6,698	$ 4,988	$ 12,909	$ 2,864	$ 4,706	$ 2,850	$ 3,321	$ 2,214	$ 27,459	$ 13,091	$ 14,537
Denominator:
Weighted average common shares outstanding - basic (in shares)									21,946,000	22,084,000	22,365,000
Weighted average effect of dilutive securities:
Stock options (in shares)									89,000	130,000	294,000
Restricted stock units (in shares)									318,000	230,000	197,000
Warrants (in shares)									28,000	18,000	2,000
Weighted average common shares outstanding - diluted (in shares)									22,381,000	22,462,000	22,858,000
Net income per share:
Basic net income per share (in dollars per share)	$ 0.30	$ 0.23	$ 0.59	$ 0.13	$ 0.22	$ 0.13	$ 0.15	$ 0.10	$ 1.25	$ 0.59	$ 0.65
Diluted net income per share (in dollars per share)	$ 0.30	$ 0.22	$ 0.58	$ 0.13	$ 0.21	$ 0.13	$ 0.15	$ 0.10	$ 1.23	$ 0.58	$ 0.64
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number of shares underlying antidilutive securities (in shares)									2,000	267,000	213,000
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number of shares underlying antidilutive securities (in shares)									0	0	0
Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number of shares underlying antidilutive securities (in shares)									0	0	0
Performance Based Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number of shares underlying antidilutive securities (in shares)									0
Granted (in shares)				21,000