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ACCUMULATED OTHER COMPREHENSIVE LOSS, Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accumulated other comprehensive loss [Abstract]    
Foreign currency translation adjustment $ (22,635) $ (16,537)
Unrealized holding gain on available-for-sale securities, net of taxes of $0 and $85 as of December 31, 2018 and 2017 12 145
Unfunded SERP liability, net of taxes of ($680) and ($1,635) as of December 31, 2018 and 2017 (2,215) (3,233)
Accumulated other comprehensive loss (24,838) (19,625)
Accumulated other comprehensive loss, tax [Abstract]    
Unrealized holding gains on available-for-sale securities, tax 0 85
Change in unfunded SERP liability, tax $ (680) $ (1,635)