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Network
090208 - Disclosure - Investments, Roll-forward of Financial Instruments Measured at Fair Value (Details)
(http://atlam.com/role/InvestmentsRollforwardOfFinancialInstrumentsMeasuredAtFairValueDetails)
TableFair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000008177 (http://www.sec.gov/CIK)
Asset Class [Axis]Fixed Maturities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
Roll-forward of the financial instruments measured at fair value on a recurring basis using significant unobservable inputs (Level 3) [Abstract]
 
 
Assets measured at fair value on a recurring basis [Abstract]
 
 
Balance, beginning of period
2,237,000  
2,214,000  
Total realized gains included in earnings
57,000  
 
Total unrealized gains (losses) included in other comprehensive income (loss)
(30,000) 
23,000  
Settlements
(1,000,000) 
 
Balance, end of period
1,264,000  
 
2,237,000