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OTHER COMPREHENSIVE INCOME (LOSS) (Tax Effects of Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Before Tax Amount    
Other Comprehensive Income (Loss), before Tax $ (108,517) $ 126,000
Tax (Expense) Benefit    
Other Comprehensive Income (Loss), Tax (1,619) (3,460)
Net of Tax Amount    
Other Comprehensive Income (Loss), Net of Tax (110,136) 122,540
Unrealized gains (losses) on available for sale investments, net of tax:    
Before Tax Amount    
Unrealized investment gains (losses) arising during the period (105,675) 70,372
Adjustment for reclassification of net realized investment losses and OTTI losses recognized in net income (4,112) 25,759
Other Comprehensive Income (Loss), before Tax (109,787) 96,131
Tax (Expense) Benefit    
Unrealized investment gains (losses) arising during the period (6,516) (2,669)
Adjustment for reclassification of net realized investment losses and OTTI losses recognized in net income 4,897 (791)
Other Comprehensive Income (Loss), Tax (1,619) (3,460)
Net of Tax Amount    
Unrealized investment gains (losses) arising during the period (112,191) 67,703
Adjustment for reclassification of net realized investment losses and OTTI losses recognized in net income 785 24,968
Other Comprehensive Income (Loss), Net of Tax (111,406) 92,671
Cumulative foreign currency translation adjustments, net of tax:    
Before Tax Amount    
Other Comprehensive Income (Loss), before Tax 1,270 29,869
Tax (Expense) Benefit    
Other Comprehensive Income (Loss), Tax 0 0
Net of Tax Amount    
Other Comprehensive Income (Loss), Net of Tax $ 1,270 $ 29,869