SIGNIFICANT ACCOUNTING POLICIES AND OTHER INFORMATION (Details 2) (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
Supplemental Cash Flow Information
Interest paid									$ 5,321	$ 6,389	$ 7,797
Income taxes paid, net of refunds									13,915	2,857	17,521
Numerator:
Net income	(295)	16,259	6,709	(448)	(5,852)	10,834	7,535	1,585	22,225	14,102	41,412
Denominator:
Weighted average number of common shares outstanding									9,812,400	10,591,642	11,416,002
Dilutive options and stock awards (in shares)									24,413	115,886	182,146
Diluted weighted average number of common shares outstanding									9,836,813	10,707,528	11,598,148
Net earnings per share
Basic (in dollars per share)	$ (0.03)	$ 1.69	$ 0.68	$ (0.04)	$ (0.57)	$ 1.05	$ 0.70	$ 0.14	$ 2.27	$ 1.33	$ 3.63
Diluted (in dollars per share)	$ (0.03)	$ 1.68	$ 0.68	$ (0.04)	$ (0.57)	$ 1.04	$ 0.69	$ 0.14	$ 2.26	$ 1.32	$ 3.57
Options excluded from the computation of diluted net earnings per share (in shares)									1,023,500	866,300	881,341
Fair Value of Financial Instruments
Variable rate debt obligations	73,793				96,793				73,793	96,793
Fixed rate debt obligations	49,891				66,953				49,891	66,953
Foreign Currency
Net foreign currency translation loss (gain) recorded in other expense									$ (351)	$ 294	$ 237