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STOCK-BASED COMPENSATION Defined contribution plan and non-cash employer-matching contributions (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Discolusre of Defined Contribution Plan 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 $ 162 $ 190
Other Postretirement Benefits Payments 0 651
Cash and Noncash pension and other postretirement contributions $ 0 $ 651