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Investments (Investment Gains and Losses) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 07, 2019
May 01, 2019
Feb. 01, 2019
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Available for sale debt securities:                  
Realized gains on disposal       $ 197   $ 1,191 $ 2,548 $ 3,212  
Realized losses on disposal       0   (6) (84) (6)  
Held to maturity debt securities:                  
Realized gains on disposal       1,246   1,090 2,197 2,395  
Realized losses on disposal       0   0 0 (19)  
Real estate gains (losses)       0   0 6,888 0  
Totals       $ 1,443   $ 2,275 $ 11,549 $ 5,582  
Investments, percentage of gains on bonds, due to calls of securities (in percentage)       99.60%   97.30% 81.00% 98.70%  
Total other-than-temporary impairment (“OTTI”) gains (losses)       $ (1,943)   $ 3 $ (7,840) $ 9  
Net OTTI losses recognized in earnings       (1,945)   0 (7,847) 0  
Non-Credit Other-than-Temporary Impairment, Credit Losses Recognized in Other Comprehensive Income (Loss) [Roll Forward]                  
Beginning balance, cumulative credit losses related to other-than-temporary impairments       627 $ 627   627 627 $ 627
Reductions for securities sold during current period       0     0   0
Additions for credit losses not previously recognized in other-than-temporary impairments       0     0   0
Ending balance, cumulative credit losses related to other-than-temporary impairments       627     627   $ 627
Debt Securities                  
Held to maturity debt securities:                  
Total other-than-temporary impairment (“OTTI”) gains (losses)       (1,943)   3 (7,840) 9  
Portion of loss (gain) recognized in comprehensive income       (2)   (3) (7) (9)  
Net OTTI losses recognized in earnings       $ (1,945)   $ 0 $ (7,847) $ 0  
Nursing Home Operations in Reno, Nevada                  
Held to maturity debt securities:                  
Real estate gains (losses)     $ 5,700            
Nursing Home Operations, San Marcos, Texas                  
Held to maturity debt securities:                  
Real estate gains (losses)   $ (2,000)              
Impairment loss         $ 2,200        
Nursing Home Operations, Austin, TX                  
Held to maturity debt securities:                  
Real estate gains (losses) $ 3,200