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Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block]: Short-duration Insurance Contracts, Claims Development (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net $ 138,136                  
Specialty Health Segment Member                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 415,985                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 375,740                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 266                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 40,511                  
Specialty Health Segment Member | Short-duration Insurance Contracts, Accident Year 2015                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 101,260 $ 100,642 $ 101,241 $ 100,988 $ 104,497          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 293                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 467,232                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 100,967 99,364 97,603 94,757 70,090          
Specialty Health Segment Member | Short-duration Insurance Contracts, Accident Year 2016                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 85,399 86,244 86,446 85,426            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1,161                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 538,382                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 84,238 82,983 78,611 45,454            
Specialty Health Segment Member | Short-duration Insurance Contracts, Accident Year 2017                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 77,194 77,214 87,070              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1,275                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 628,748                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 75,918 73,667 49,289              
Specialty Health Segment Member | Short-duration Insurance Contracts, Accident Year 2018                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 69,206 74,652                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 4,259                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 661,819                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 64,947 46,574                
Specialty Health Segment Member | Short-Duration Insurance Contract, Accident Year 2019                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 82,926                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 33,257                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 537,636                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 49,670                  
Group disability, life, DBL and PFL | NY Short-Term Disability Product Line                    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 22,774                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 18,000                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net $ 22,774                  
Group disability, life, DBL and PFL | Group Disability Product Line                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 205,838                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 156,436                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 17,737                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 67,139                  
Group disability, life, DBL and PFL | Short-duration Insurance Contracts, Accident Year 2015 | Group Disability Product Line                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 14,552 14,705 16,630 19,247 25,335          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 219                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 3,253                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 17,623 17,203 16,634 14,034 6,825          
Group disability, life, DBL and PFL | Short-duration Insurance Contracts, Accident Year 2016 | Group Disability Product Line                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 25,988 27,359 28,568 28,450            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 331                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 3,498                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 20,261 19,269 16,379 8,333            
Group disability, life, DBL and PFL | Short-duration Insurance Contracts, Accident Year 2017 | Group Disability Product Line                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 22,851 26,021 29,897              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 425                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 3,777                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 17,901 16,139 8,459              
Group disability, life, DBL and PFL | Short-duration Insurance Contracts, Accident Year 2018 | Group Disability Product Line                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 26,610 29,766                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1,603                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 3,997                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 16,109 8,417                
Group disability, life, DBL and PFL | Short-Duration Insurance Contract, Accident Year 2019 | NY Short-Term Disability Product Line                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 65,452                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 42,678                  
Group disability, life, DBL and PFL | Short-Duration Insurance Contract, Accident Year 2019 | Group Disability Product Line                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 34,518                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 10,972                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 3,439                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 11,794                  
Group disability, life, DBL and PFL | Short-duration Insurance Contracts, Accident Year 2010 | Group Disability Product Line                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 6,857 6,938 7,239 6,599 3,030 $ 3,965 $ 4,245 $ 6,263 $ 10,561 $ 11,990
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 2,311                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 12,902 12,565 12,200 11,797 11,284 10,762 10,345 9,799 8,200 $ 3,197
Group disability, life, DBL and PFL | Short-duration Insurance Contracts, Accident Year 2011 | Group Disability Product Line                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 16,546 16,516 16,712 16,672 15,730 15,271 16,166 16,948 18,558  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 2,337                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 12,979 12,522 11,993 11,363 10,737 10,186 9,622 8,191 $ 3,252  
Group disability, life, DBL and PFL | Short-duration Insurance Contracts, Accident Year 2012 | Group Disability Product Line                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 11,883 12,161 12,472 12,585 12,177 12,187 13,708 15,356    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 2,263                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 10,177 9,924 9,509 8,997 8,591 8,033 7,003 $ 3,069    
Group disability, life, DBL and PFL | Short-duration Insurance Contracts, Accident Year 2013 | Group Disability Product Line                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 31,545 31,378 31,664 32,070 29,893 30,832 32,952      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 505                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 2,629                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 25,029 23,460 21,536 19,428 16,424 12,541 $ 5,454      
Group disability, life, DBL and PFL | Short-duration Insurance Contracts, Accident Year 2014 | Group Disability Product Line                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 14,488 14,311 14,414 14,792 13,322 16,314        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 165                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 2,783                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 11,661 $ 11,142 $ 10,623 $ 9,919 $ 8,466 $ 3,663