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INCOME TAXES - Provision for income taxes (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
Federal $ 4,871 $ 5,016 $ 5,778
Federal - Deemed Repatriation 1,102 0 0
State (1,435) 955 913
Foreign 3,653 1,965 1,623
Current income tax expense 8,191 7,936 8,314
Deferred:      
Federal (919) 3,057 548
State 150 205 47
Foreign (99) (43) (22)
Deferred income tax expense (868) 3,219 573
Income tax expense $ 7,323 $ 11,155 $ 8,887