XML 83 R50.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Investments, Investments Temporarily Impaired (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Investment
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 113
Estimated fair value, less than 12 months of temporary impairment $ 375,944
Unrealized losses, less than 12 months of temporary impairment (255)
Estimated fair value, more than 12 months of temporary impairment 59,184
Unrealized losses, more than 12 months of temporary impairment (41)
Estimated fair value, total temporary impairment 435,128
Unrealized losses, total temporary impairment $ (296)
Corporate Debt Securities [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 49
Estimated fair value, less than 12 months of temporary impairment $ 131,702
Unrealized losses, less than 12 months of temporary impairment (75)
Estimated fair value, more than 12 months of temporary impairment 11,840
Unrealized losses, more than 12 months of temporary impairment (11)
Estimated fair value, total temporary impairment 143,542
Unrealized losses, total temporary impairment $ (86)
Debt Securities issued by U.S. Government Agencies [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 43
Estimated fair value, less than 12 months of temporary impairment $ 149,731
Unrealized losses, less than 12 months of temporary impairment (136)
Estimated fair value, more than 12 months of temporary impairment 37,041
Unrealized losses, more than 12 months of temporary impairment (24)
Estimated fair value, total temporary impairment 186,772
Unrealized losses, total temporary impairment $ (160)
Debt Securities issued by the U.S. Treasury [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 10
Estimated fair value, less than 12 months of temporary impairment $ 84,270
Unrealized losses, less than 12 months of temporary impairment (39)
Estimated fair value, more than 12 months of temporary impairment 0
Unrealized losses, more than 12 months of temporary impairment 0
Estimated fair value, total temporary impairment 84,270
Unrealized losses, total temporary impairment $ (39)
Debt Securities issued by States of the U.S. and Political Subdivisions of the States [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 11
Estimated fair value, less than 12 months of temporary impairment $ 10,241
Unrealized losses, less than 12 months of temporary impairment (5)
Estimated fair value, more than 12 months of temporary impairment 10,303
Unrealized losses, more than 12 months of temporary impairment (6)
Estimated fair value, total temporary impairment 20,544
Unrealized losses, total temporary impairment $ (11)