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OPERATING LEASES (Net Rent Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
OPERATING LEASES      
Total net rent expense $ 8,676 $ 9,292 $ 10,263
Net Occupancy      
OPERATING LEASES      
Add: rent expense charged to equipment expense 8,700 9,287 10,210
Less: sublease income (43) (25) 0
Total net rent expense 8,657 9,262 10,210
Equipment      
OPERATING LEASES      
Add: rent expense charged to equipment expense $ 19 $ 30 $ 53
Minimum      
OPERATING LEASES      
Period for which option to extend the lease term is available 5 years    
Maximum      
OPERATING LEASES      
Period for which option to extend the lease term is available 15 years