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Contingencies and Other Matters - Legal and Regulatory Matters (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2018
Amara cash balance pension plan litigation [Member]    
Contingency Accrual [Roll Forward]    
Amounts paid for loss contigency   $ 32,280
Guaranty Fund Assessments [Member]    
Contingency Accrual [Roll Forward]    
Charges for loss contingency, pre-tax $ 130,000
Charges for loss contingency, after-tax $ 85,000  
Loss Contingency, Insurance-related Assessment [Abstract]    
Recorded liability, Penn Treaty assessment   42,000
Pending Litigation [Member]    
Contingency Accrual [Roll Forward]    
Reserves for litigation matters, pre-tax   190,000
Reserves for litigation matters, after-tax   150,000
Pending Litigation [Member] | Pricing concessions through remaining contract term [Member] | Express Scripts litigation with Antherm [Member]    
Loss Contingency, Information about Litigation Matters [Abstract]    
Loss Contingency, Damages Sought   13,000,000
Pending Litigation [Member] | Pricing concessions after remaining term of agreement [Member] | Express Scripts litigation with Antherm [Member]    
Loss Contingency, Information about Litigation Matters [Abstract]    
Loss Contingency, Damages Sought   1,800,000
Pending Litigation [Member] | Damages for service issues [Member] | Express Scripts litigation with Antherm [Member]    
Loss Contingency, Information about Litigation Matters [Abstract]    
Loss Contingency, Damages Sought   $ 150,000