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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
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Discolusre of Compensation Related Costs, Share-based Payments [Abstract]        
Share-based compensation arrangement award vesting period     5 years  
Defined contribution pan, maximum annual contribution per employee percent     15.00%  
Defined contribution plan, employer matching contribution percent     3.00%  
Defined Contribution Plan, Cost Recognized $ 152 $ 175 $ 342 $ 368
Number of shares of the Company's common stock issued 0 0 0 124
Market value per share of the Company's common stock on contribution date (in dollars) $ 0.00 $ 0.00 $ 0.00 $ 5.35
Defined Contribution Plan, Employer Discretionary Non-cash Contribution Made for Employer Matching Liability 0 0 0 666
Other Postretirement Benefits Payments 0 0 651 0
Cash and Noncash pension and other postretirement contributions $ 0 $ 0 $ 651 $ 666