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ACCUMULATED OTHER COMPREHENSIVE LOSS, Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Accumulated other comprehensive loss [Abstract]    
Foreign currency translation adjustment, net of taxes $ (22,929) $ (22,635)
Unrealized holding gains on available-for-sale securities, net of taxes 12 12
Unfunded SERP liability, net of taxes (2,604) (2,215)
Accumulated other comprehensive loss (25,521) (24,838)
Accumulated other comprehensive loss, tax [Abstract]    
Foreign currency translation adjustment, tax (752) (751)
Unrealized holding gains on available-for-sale securities, tax 0 0
Change in unfunded SERP liability, tax $ (195) $ (680)