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Investments (Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Security Type) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Market Value, Total $ 2,148,050 $ 2,510,133
Available-for-sale Securities, Gross Unrealized Depreciation, Total (55,011) (66,508)
Fixed Maturity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Less than 12 months, Market Value 1,838,481 2,154,821
Available for sale securities, Less than 12 months, Gross Unrealized Depreciation (33,746) (40,537)
Available for sale securities, Greater than 12 months, Market Value 309,569 355,312
Available for sale securities, Greater than 12 months, Gross Unrealized Depreciation (21,265) (25,971)
Available-for-sale Securities, Market Value, Total 2,148,050 2,510,133
Available-for-sale Securities, Gross Unrealized Depreciation, Total (55,011) (66,508)
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Less than 12 months, Market Value 331,049 469,571
Available for sale securities, Less than 12 months, Gross Unrealized Depreciation (3,901) (4,434)
Available for sale securities, Greater than 12 months, Market Value
Available for sale securities, Greater than 12 months, Gross Unrealized Depreciation
Available-for-sale Securities, Market Value, Total 331,049 469,571
Available-for-sale Securities, Gross Unrealized Depreciation, Total (3,901) (4,434)
Obligations of U.S. States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Less than 12 months, Market Value 206,241 221,088
Available for sale securities, Less than 12 months, Gross Unrealized Depreciation (10,966) (11,486)
Available for sale securities, Greater than 12 months, Market Value 492 564
Available for sale securities, Greater than 12 months, Gross Unrealized Depreciation (560) (484)
Available-for-sale Securities, Market Value, Total 206,733 221,652
Available-for-sale Securities, Gross Unrealized Depreciation, Total (11,526) (11,970)
Corporate Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Less than 12 months, Market Value 441,626 431,757
Available for sale securities, Less than 12 months, Gross Unrealized Depreciation (7,815) (10,121)
Available for sale securities, Greater than 12 months, Market Value 88,102 118,172
Available for sale securities, Greater than 12 months, Gross Unrealized Depreciation (4,039) (5,665)
Available-for-sale Securities, Market Value, Total 529,728 549,929
Available-for-sale Securities, Gross Unrealized Depreciation, Total (11,854) (15,786)
Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Less than 12 months, Market Value 40,290 35,065
Available for sale securities, Less than 12 months, Gross Unrealized Depreciation (73) (122)
Available for sale securities, Greater than 12 months, Market Value 4,026 5,745
Available for sale securities, Greater than 12 months, Gross Unrealized Depreciation (2) (7)
Available-for-sale Securities, Market Value, Total 44,316 40,810
Available-for-sale Securities, Gross Unrealized Depreciation, Total (75) (129)
Commercial Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Less than 12 months, Market Value 8,255 27,230
Available for sale securities, Less than 12 months, Gross Unrealized Depreciation (297) (391)
Available for sale securities, Greater than 12 months, Market Value 3,072 3,060
Available for sale securities, Greater than 12 months, Gross Unrealized Depreciation (27) (61)
Available-for-sale Securities, Market Value, Total 11,327 30,290
Available-for-sale Securities, Gross Unrealized Depreciation, Total (324) (452)
Agency Residential [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Less than 12 months, Market Value 465,110 487,000
Available for sale securities, Less than 12 months, Gross Unrealized Depreciation (6,116) (6,320)
Available for sale securities, Greater than 12 months, Market Value 86,304 90,740
Available for sale securities, Greater than 12 months, Gross Unrealized Depreciation (2,249) (2,673)
Available-for-sale Securities, Market Value, Total 551,414 577,740
Available-for-sale Securities, Gross Unrealized Depreciation, Total (8,365) (8,993)
Non-agency Residential [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Less than 12 months, Market Value 20
Available for sale securities, Less than 12 months, Gross Unrealized Depreciation
Available for sale securities, Greater than 12 months, Market Value
Available for sale securities, Greater than 12 months, Gross Unrealized Depreciation
Available-for-sale Securities, Market Value, Total 20
Available-for-sale Securities, Gross Unrealized Depreciation, Total
Foreign Government Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Less than 12 months, Market Value 140,028 218,171
Available for sale securities, Less than 12 months, Gross Unrealized Depreciation (1,524) (2,713)
Available for sale securities, Greater than 12 months, Market Value 56,147 61,542
Available for sale securities, Greater than 12 months, Gross Unrealized Depreciation (5,401) (7,670)
Available-for-sale Securities, Market Value, Total 196,175 279,713
Available-for-sale Securities, Gross Unrealized Depreciation, Total (6,925) (10,383)
Foreign Corporate Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Less than 12 months, Market Value 205,862 264,939
Available for sale securities, Less than 12 months, Gross Unrealized Depreciation (3,054) (4,950)
Available for sale securities, Greater than 12 months, Market Value 71,426 75,489
Available for sale securities, Greater than 12 months, Gross Unrealized Depreciation (8,987) (9,411)
Available-for-sale Securities, Market Value, Total 277,288 340,428
Available-for-sale Securities, Gross Unrealized Depreciation, Total $ (12,041) $ (14,361)