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STOCK-BASED COMPENSATION Defined contribution plan and non-cash employer-matching contributions (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Defined contribution pan, maximum annual contribution per employee percent 15.00%    
Defined contribution plan, employer matching contribution percent 3.00%    
Share-based compensation arrangement award vesting period 5 years    
Expense recognized for the 401(k) plan $ 635 $ 686 $ 610
Number of shares of the Company's common stock issued (in thousands) 124 92 121
Market value per share of the Company's common stock on contribution date (in dollars) $ 5.35 $ 6.55 $ 4.47
Non-cash contribution made for employer matching liability 666 602 541
Additional cash contribution made for employer-matching liability 0 0 111
Total contribution made for employer-matching liability $ 666 $ 602 $ 652