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DEBT (Revolving Credit Agreement) (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Debt        
Amounts due banks   $ 2,822 $ 2,822 $ 61,155
Revolving credit agreement        
Debt        
Borrowing capacity under the line of credit   $ 400,000 $ 400,000  
Credit agreement initiation date Sep. 12, 2014      
Credit facility covenant compliance     As of December 31, 2015, the Company was in compliance with all of its covenants  
Debt Instrument, Term   5 years    
Additional increase in borrowing capacity of the line of credit available at the entity's option   $ 100,000 $ 100,000