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LONG-TERM OBLIGATIONS - Long-term obligations (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Long-Term Debt, Unclassified [Abstract]
Equipment notes, weighted average interest rate of 4.4%, payable in monthly installments		$ 5
Less current portion		(5)
Long-term debt, excluding current maturities

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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