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LEASE COMMITMENTS - Future Minimum Lease Payments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Future minimum payments under operating leases      
2016 $ 1,071    
2017 1,071    
2018 1,071    
2019 1,071    
2020 1,071    
Total minimum lease payments 5,355    
Rental expense for operating leases $ 1,039 $ 889 $ 907