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AVAILABLE-FOR-SALE SECURITIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
AVAILABLE-FOR-SALE SECURITIES    
Cost $ 142,546 $ 91,200
Accumulated impairment losses (44,070) (36,017)
Unrealized gains in accumulated other comprehensive income 24,669 37,634
Unrealized losses in accumulated other comprehensive income (370) (507)
Total estimated fair value of available-for-sale securities 122,775 92,310
Net proceeds from sale of available-for-sale securities 300 6,000
Gain on sale of available-for-sale securities before income taxes 168 $ 3,500
Impairment loss on available-for- sale securities $ 8,532