EARNINGS (LOSS) PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Basic and diluted net earnings per share
Net earnings applicable to common shareholders	$ 5,257	$ 9,027	$ 9,065	$ 8,449
Weighted average shares outstanding - basic	71,062,658	70,815,871	71,043,874	70,779,033
Effect of dilutive securities - stock options	895,656	1,225,817	1,050,449	1,328,023
Weighted average shares outstanding - diluted	71,958,314	72,041,688	72,094,323	72,107,056
Basic net earnings per share (in dollars per share)	$ 0.07	$ 0.13	$ 0.13	$ 0.12
Diluted net earnings per share (in dollars per share)	$ 0.07	$ 0.13	$ 0.13	$ 0.12
Convertible bonds and preferred stock
Earnings (loss) per share
Anti-dilutive securities (in shares)			52,093	52,522
Stock options and restricted stock
Earnings (loss) per share
Anti-dilutive securities (in shares)			1,705,448	1,533,045
Stock Options
Earnings (loss) per share
Weighted average exercise price (in dollars per share)	$ 2.90	$ 4.00	$ 2.90	$ 4.00
Convertible bonds
Earnings (loss) per share
Percentage of principal amount that may be converted from the date of issuance until maturity into common stock	100.00%		100.00%
Convertible bonds | Minimum
Earnings (loss) per share
Conversion price (in dollars per share)	$ 35		$ 35
Convertible bonds | Maximum
Earnings (loss) per share
Conversion price (in dollars per share)	$ 50		$ 50