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Investment Operations Available for Sale Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Other than Temporary Impairment Losses, Investments Portion in Other Comprehensive Income, Before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities [1]
Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 6,661,711 6,379,919
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 421,140 412,919
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 74,061 155,062
Available-for-sale Securities 7,008,790 6,637,776
Other than Temporary Impairment Losses, Investments Portion in Other Comprehensive Income, Before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities [1] 479 (175)
Corporate    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 3,529,997 3,464,402
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 228,601 192,149
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 49,943 137,844
Available-for-sale Securities 3,708,655 3,518,707
Other than Temporary Impairment Losses, Investments Portion in Other Comprehensive Income, Before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities (1,082) 351
Other Debt Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities 23,300 43,500
Redeemable Preferred Stock [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities 24,500 24,800
Residential mortgage-backed    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 396,110 436,969
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 29,121 33,880
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 2,931 5,343
Available-for-sale Securities 422,300 465,506
Other than Temporary Impairment Losses, Investments Portion in Other Comprehensive Income, Before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities (983) (3,584)
Commercial mortgage-backed    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 546,446 514,195
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 33,645 42,284
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 4,137 2,487
Available-for-sale Securities 575,954 553,992
Other than Temporary Impairment Losses, Investments Portion in Other Comprehensive Income, Before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities 0 0
Other asset-backed    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 771,570 578,692
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 8,846 11,554
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 9,766 7,124
Available-for-sale Securities 770,650 583,122
Other than Temporary Impairment Losses, Investments Portion in Other Comprehensive Income, Before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities 2,544 3,058
United States Government and agencies    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 30,575 41,050
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 1,629 3,129
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 132 81
Available-for-sale Securities 32,072 44,098
Other than Temporary Impairment Losses, Investments Portion in Other Comprehensive Income, Before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities 0 0
State, municipal and other governments    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 1,387,013 1,344,611
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 119,298 129,923
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 7,152 2,183
Available-for-sale Securities 1,499,159 1,472,351
Other than Temporary Impairment Losses, Investments Portion in Other Comprehensive Income, Before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities 0 0
Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 130,479 116,336
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 4,164 6,545
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax 1,675 1,214
Available-for-sale Securities 132,968 121,667
Non-redeemable preferred stocks    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 100,042 87,029
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 4,050 6,095
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax 1,675 1,173
Available-for-sale Securities 102,417 91,951
Common stocks    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 30,437 29,307
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 114 450
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax 0 41
Available-for-sale Securities $ 30,551 $ 29,716
[1] Non-credit losses subsequent to the initial impairment measurement date on OTTI losses are included in the gross unrealized gains and gross unrealized losses columns above. The non-credit loss component of OTTI losses for other asset-backed securities were in an unrealized gain position at December 31, 2016 and corporate and other asset-backed securities at December 31, 2015 due to increases in estimated fair value subsequent to initial recognition of non-credit losses on such securities.