BORROWINGS (Details 2) (USD $)	1 Months Ended	12 Months Ended
	Nov. 30, 2004	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Borrowings
Amortization of discount and debt issuance costs		$ 73,000	$ 127,000	$ 391,000
Payments to retire convertible senior notes			34,615,000	24,865,000
Gain (loss) on early extinguishment of debt			(54,000)	346,000
Affiliated Entity
Borrowings
Minimum beneficial ownership in the entity (as a percent)			5.00%
3.75% Convertible Senior Notes
Borrowings
Interest rate (as a percent)	3.75%
Offering amount	120,000,000
Net proceeds	116,200,000
Initial purchaser's discount and debt issuance costs	3,800,000
Amortization of discount and debt issuance costs		0	77,000	228,000
Amount of debt retired			34,600,000	25,400,000
Payments to retire convertible senior notes			34,600,000	24,900,000
Gain (loss) on early extinguishment of debt			(54,000)	346,000
Debt discount at extinguishment			77,000	158,000
3.75% Convertible Senior Notes | Chou or an affiliate of Chou
Borrowings
Amount of debt retired			10,100,000
3.75% Convertible Senior Notes | Fairfax or an affiliate of Fairfax
Borrowings
Amount of debt retired			$ 21,700,000