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Fair Value Measurements (Quantitative Disclosures of Fair Value Assets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
AFS Fixed Income Securities $ 5,567,358 $ 5,273,100
Short-term investments 290,653 323,864
Net Asset Value 40,000 23,700
Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities 5,567,358 5,273,100
Equity securities 163,016 147,639
Short-term investments 290,653 323,864
Total assets measured at fair value 6,021,027 5,744,603
U.S. Government and Government Agencies [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities 127,089 121,310
Foreign Government [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities 20,526 23,131
Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities 1,150,243 1,138,469
Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities 1,678,015 1,617,408
Collateralized Loan Obligations and Other Asset Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities 722,240 717,362
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities 568,200 527,078
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities 1,301,045 1,128,342
Common Stock [Member] | Fair Value, Measurements, Recurring [Member]    
Equity securities [1] 160,011 144,727
Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member]    
Equity securities 3,005 2,912
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities [2] 68,645 78,381
Equity securities [2] 122,982 110,309
Short-term investments [2] 289,232 321,370
Total assets measured at fair value [2] 480,859 510,060
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | U.S. Government and Government Agencies [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities [2] 68,645 78,381
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities [2] 0 0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities [2] 0 0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities [2] 0 0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Collateralized Loan Obligations and Other Asset Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities [2] 0 0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities [2] 0 0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities [2] 0 0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Common Stock [Member] | Fair Value, Measurements, Recurring [Member]    
Equity securities [1],[2] 119,977 107,397
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member]    
Equity securities [2] 3,005 2,912
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities [2] 5,451,002 5,187,310
Equity securities [2] 0 0
Short-term investments [2] 1,421 2,494
Total assets measured at fair value [2] 5,452,423 5,189,804
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government and Government Agencies [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities [2] 58,444 42,929
Significant Other Observable Inputs (Level 2) [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities [2] 20,526 23,131
Significant Other Observable Inputs (Level 2) [Member] | Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities [2] 1,150,243 1,138,469
Significant Other Observable Inputs (Level 2) [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities [2] 1,661,596 1,617,408
Significant Other Observable Inputs (Level 2) [Member] | Collateralized Loan Obligations and Other Asset Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities [2] 690,948 709,953
Significant Other Observable Inputs (Level 2) [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities [2] 568,200 527,078
Significant Other Observable Inputs (Level 2) [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities [2] 1,301,045 1,128,342
Significant Other Observable Inputs (Level 2) [Member] | Common Stock [Member] | Fair Value, Measurements, Recurring [Member]    
Equity securities [1],[2] 0 0
Significant Other Observable Inputs (Level 2) [Member] | Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member]    
Equity securities [2] 0 0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities 47,711 7,409
Equity securities 0 0
Short-term investments 0 0
Total assets measured at fair value 47,711 7,409
Significant Unobservable Inputs (Level 3) [Member] | U.S. Government and Government Agencies [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities 16,419 0
Significant Unobservable Inputs (Level 3) [Member] | Collateralized Loan Obligations and Other Asset Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities 31,292 7,409
Significant Unobservable Inputs (Level 3) [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]    
AFS Fixed Income Securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Common Stock [Member] | Fair Value, Measurements, Recurring [Member]    
Equity securities [1] 0 0
Significant Unobservable Inputs (Level 3) [Member] | Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member]    
Equity securities $ 0 $ 0
[1] Investments amounting to $40.0 million at March 31, 2019, and $23.7 million at December 31, 2018, were measured at fair value using net asset value per share (or its practical expedient) and have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to total assets measured at fair value.
[2] There were no transfers of securities between Level 1 and Level 2.