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INVESTMENTS (Equity Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Investment [Line Items]    
Cost $ 374,091 $ 552,867
Gross Unrealized Gains 63,142 84,527
Gross Unrealized Losses (1,491) (1,883)
Equity securities 435,742 635,511
Common stocks    
Investment [Line Items]    
Cost 23,251 22,836
Gross Unrealized Gains 1,668 3,412
Gross Unrealized Losses (977) (590)
Equity securities 23,942 25,658
Exchange-traded funds    
Investment [Line Items]    
Cost 211,301 356,252
Gross Unrealized Gains 51,843 71,675
Gross Unrealized Losses (514) (294)
Equity securities 262,630 427,633
Bond mutual funds    
Investment [Line Items]    
Cost 139,539 173,779
Gross Unrealized Gains 9,631 9,440
Gross Unrealized Losses 0 (999)
Equity securities $ 149,170 $ 182,220