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Policy Claims and Benefits (Reconciliation of Claims Development to Liability) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments $ 432,582 $ 455,547 $ 394,821 $ 405,583
Short-duration Insurance Contract, Discounted Liability, Discount 119,661      
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claim Adjustment Expense, Other Reconciling Item 2,168,298      
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claim Adjustment Expense, Aggregate Reconciling Items 4,416,370      
Liability for Claims and Claims Adjustment Expense 6,584,668 $ 5,896,469 $ 5,180,802 $ 4,977,836
Canada Segment Reporting Information [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claim Adjustment Expense, Other Reconciling Item 128,831      
EMEA [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claim Adjustment Expense, Other Reconciling Item 383,936      
Corporate And Other Segment Reporting Information [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claim Adjustment Expense, Other Reconciling Item 177,416      
Life Insurance Product Line [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 1,597,776      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 16,121      
Short-duration Insurance Contract, Discounted Liability, Discount for Reinsurance (141,689)      
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claims Adjustment Expense, Accumulated Unallocated Claim Adjustment Expense 5,907      
Life Insurance Product Line [Member] | Americas [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [1] 856,386      
Life Insurance Product Line [Member] | Asia Pacific [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [1] $ 741,390      
[1] 2012-2017 Unaudited.