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OTHER INCOME (EXPENSE) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other Income and Expenses [Abstract]      
Equity investment income $ 3,993 $ 3,615 $ 2,977
Interest income 2,107 3,363 3,206
Rental Income, Nonoperating 1,804 2,372 2,109
Investment gain (loss) related to investments for deferred compensation 687 2,725 190
Other income (expense) 10,607 (2,967) 1,433
Other income $ 19,198 $ 9,108 $ 9,915