ACCOUNTING POLICIES (Details 5) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Earnings per share
Net income (loss) attributable to common shares	$ 7,697	$ 2,719	$ 19,647	$ (16,275)
Net income per common share-basic:
Net income attributable to common shares-basic (in dollars per share)	$ 0.33	$ 0.12
Weighted average common shares outstanding-basic	23,594	23,392
Effect of dilutive securities:
Stock options and restricted stock awards (in shares)	422	22
Weighted average common shares outstanding-diluted	24,016	23,414
Net income attributable to common shares-diluted (in dollars per share)	$ 0.32	$ 0.12
Stock options and restricted stock awards
Anti-dilutive securities excluded from computation of earnings per share
Anti-dilutive securities excluded from computation of earnings per share (in shares)	575	1,375