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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounting Standards (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Mar. 31, 2018
Jan. 01, 2018
Accumulated other comprehensive earnings $ (22,344)   $ (22,344)   $ 157,919    
Retained earnings 983,126   983,126   788,522    
Net unrealized gains (losses) on equity securities 4,848   (34,535)        
Expected Value Of Asset And Liability Addition From Adoption Of ASU 2016-02 $ 33,000   $ 33,000        
Expense associated with operating leases         $ 7,000    
Percentage Of Fixed Income Portfolio Rated A Or Better 82.80%   82.80%        
Tax rate used (as a percent) 21.00% 35.00% 21.00% 35.00%      
Allocated Share-based Compensation Expense $ 1,200 $ 1,000 $ 3,400 $ 3,000      
Accounting Standards Update 2014-09              
Percent of Revenue Out of Scope of ASU 2014-09     99.00%        
Accounting Standards Update 2016-01              
Accumulated other comprehensive earnings             $ (142,200)
Retained earnings             $ 142,200
Net unrealized gains (losses) on equity securities     $ (34,500)        
Unrealized Gain (Loss) Net Of Tax On Equity Securities Recognized in Other Comprehensive Income       14,600      
Reduction to income tax expense     $ 7,300        
Accounting Standards Update 2018-02              
Accumulated other comprehensive earnings           $ 3,700  
Retained earnings           $ (3,700)  
Tax rate used (as a percent)     21.00%   35.00%    
Restricted Stock Units (RSUs) [Member]              
Allocated Share-based Compensation Expense 200 $ 100 $ 400 $ 300      
Outside director | Restricted Stock Units (RSUs) [Member]              
Allocated Share-based Compensation Expense $ 100   $ 200