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INCOME TAXES - Provision for income taxes (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current:      
Federal $ 5,016 $ 5,778 $ 5,953
State 955 913 707
Foreign 1,965 1,623 1,853
Current income tax expense 7,936 8,314 8,513
Deferred:      
Federal 3,057 548 283
State 205 47 32
Foreign (43) (22) (168)
Deferred income tax expense 3,219 573 147
Income tax expense $ 11,155 $ 8,887 $ 8,660