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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, 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 $ 138,131              
Specialty Health Segment Member                
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 597,980              
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 546,327              
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 57              
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 51,710              
Specialty Health Segment Member | Short-duration Insurance Contracts, Accident Year 2013                
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 181,113 $ 181,114 $ 180,595 $ 181,454 $ 180,649      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 660              
Short-duration Insurance Contracts, Number of Reported Claims 447,248              
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 180,453 180,520 179,750 179,023 131,801      
Specialty Health Segment Member | Short-duration Insurance Contracts, Accident Year 2014                
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 142,110 141,869 140,139 146,060        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1,739              
Short-duration Insurance Contracts, Number of Reported Claims 405,798              
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 140,371 139,162 134,557 103,064        
Specialty Health Segment Member | Short-duration Insurance Contracts, Accident Year 2015                
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 101,241 100,988 104,497          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 3,638              
Short-duration Insurance Contracts, Number of Reported Claims 392,846              
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 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 86,446 85,426            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 7,835              
Short-duration Insurance Contracts, Number of Reported Claims 441,619              
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 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 87,070              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 37,781              
Short-duration Insurance Contracts, Number of Reported Claims 436,623              
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 49,289              
Group disability, life and DBL Segment Member | NY Short-Term Disability Product Line                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 6,579              
Short-duration Insurance Contracts, Number of Reported Claims 11,000              
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net $ 6,579              
Group disability, life and DBL Segment Member | Group Disability Product Line                
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 163,296              
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 112,053              
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 21,189              
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 72,432              
Group disability, life and DBL Segment Member | Short-duration Insurance Contracts, Accident Year 2013 | Group Disability Product Line                
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 32,575 32,888 30,546 31,323 33,143      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 241              
Short-duration Insurance Contracts, Number of Reported Claims 2,629              
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 22,448 20,246 17,077 13,032 5,645      
Group disability, life and DBL Segment Member | Short-duration Insurance Contracts, Accident Year 2014 | Group Disability Product Line                
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 14,881 15,228 13,678 16,469        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 314              
Short-duration Insurance Contracts, Number of Reported Claims 2,781              
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 11,090 10,355 8,823 3,818        
Group disability, life and DBL Segment Member | Short-duration Insurance Contracts, Accident Year 2015 | Group Disability Product Line                
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 17,427 19,929 25,621          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 579              
Short-duration Insurance Contracts, Number of Reported Claims 3,246              
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 17,430 14,715 7,111          
Group disability, life and DBL Segment Member | Short-duration Insurance Contracts, Accident Year 2016 | Group Disability Product Line                
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 29,382 28,907            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1,407              
Short-duration Insurance Contracts, Number of Reported Claims 3,475              
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 17,193 8,790            
Group disability, life and DBL Segment Member | Short-duration Insurance Contracts, Accident Year 2017 | NY Short-Term Disability Product Line                
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 20,428              
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 13,849              
Group disability, life and DBL Segment Member | Short-duration Insurance Contracts, Accident Year 2017 | Group Disability Product Line                
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 30,273              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 11,151              
Short-duration Insurance Contracts, Number of Reported Claims 2,944              
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 8,834              
Group disability, life and DBL Segment Member | Short-duration Insurance Contracts, Accident Year 2010 | Group Disability Product Line                
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 8,658 7,925 4,220 5,049 5,222 $ 7,142 $ 11,218 $ 12,329
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0              
Short-duration Insurance Contracts, Number of Reported Claims 2,311              
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 12,641 12,219 11,678 11,135 10,700 10,135 8,456 $ 3,288
Group disability, life and DBL Segment Member | Short-duration Insurance Contracts, Accident Year 2011 | Group Disability Product Line                
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 17,224 17,157 16,179 15,699 16,569 17,301 18,669  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 60              
Short-duration Insurance Contracts, Number of Reported Claims 2,337              
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 12,505 11,847 11,186 10,613 10,025 8,544 $ 3,463  
Group disability, life and DBL Segment Member | Short-duration Insurance Contracts, Accident Year 2012 | Group Disability Product Line                
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 12,876 12,965 12,535 12,522 13,999 15,510    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 172              
Short-duration Insurance Contracts, Number of Reported Claims 2,263              
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 9,912 $ 9,377 $ 8,949 $ 8,367 $ 7,294 $ 3,222