DEBT (Details 2) (USD $)	0 Months Ended	3 Months Ended
	Dec. 19, 2012	Mar. 31, 2013	Dec. 31, 2012
Convertible Senior Notes
Carrying value of unsecured debt		$ 67,411,000	$ 67,289,000
2015 Convertible Notes
Convertible Senior Notes
Aggregate principal amount	69,000,000
Principle amount issued to initial purchasers	60,500,000
Amount issued to initial purchasers' exercise in full of their overallotment option	9,000,000
Principle amount issued to certain directors	8,500,000
Net proceeds	66,200,000
Initial purchasers' discount	2,100,000
Aggregate estimated offering expenses	2,800,000
Carrying value of unsecured debt		67,400,000	67,300,000
Interest rate (as a percent)	7.00%
Effective interest rate used to amortize the debt discount		9.40%
Interest charged on indebtedness		1,600,000
Initial conversion rate		53.6107
Principal amount used for debt instrument conversion ratio		1,000
Initial conversion price (in dollars per share)		$ 18.65
Regular quarterly dividends beyond which an adjustment will be made in conversion rate (in dollars per share)		$ 0.35
Initial value of derivative liability	1,700,000
Percentage of accretion of Original issue discount and associated costs		9.40%
Fair value of derivative liability		2,200,000	1,800,000
Amount of sinking fund provided for debt		$ 0
Repurchase price of debt instrument as percentage of principal amount		100.00%
2015 Convertible Notes | Maximum
Convertible Senior Notes
Common Stock issuable upon conversion of debt instrument		1,853,432
Initial conversion rate		61.6523
Percentage of common stock issued on conversion without shareholders's approval		20.00%