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Fair Value Measurements (Quantitative Disclosures of Fair Value Assets) (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Available-for-sale Securities, Debt Securities |  | $ 4,832,532 | $ 4,408,203
Equity securities, AFS |  | 147,304 | 207,051
Total AFS securities |  | 4,979,836 | 4,615,254
Short-term investments |  | 169,604 | 194,819
Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 4,832,532 | 4,408,203
Equity securities, AFS |  | 147,304 | 207,051
Total AFS securities |  | 4,979,836 | 4,615,254
Short-term investments |  | 169,604 | 194,819
Total assets measured at fair value |  | 5,149,440 | 4,810,073
U.S. Government and Government Agencies [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 89,891 | 104,115
Foreign Government [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 9,484 | 15,181
Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 1,446,896 | 1,359,142
Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 2,196,118 | 1,900,182
Asset-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 284,453 | 244,154
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 266,774 | 243,592
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 538,916 | 541,837
Common Stock [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Equity securities, AFS |  | 135,489 | 194,789
Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Equity securities, AFS |  | 11,815 | 12,262
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities | [1] | 35,147 | 42,702
Equity securities, AFS | [1] | 139,628 | 203,779
Total AFS securities | [1] | 174,775 | 246,481
Short-term investments | [1] | 169,604 | 194,819
Total assets measured at fair value | [1] | 344,379 | 441,300
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | U.S. Government and Government Agencies [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities | [1] | 35,147 | 42,702
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities | [1] | 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] |  |  |
Available-for-sale Securities, Debt Securities | [1] | 0 | 0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities | [1] | 0 | 0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Asset-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities | [1] | 0 | 0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities | [1] | 0 | 0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities | [1] | 0 | 0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Common Stock [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Equity securities, AFS | [1] | 127,813 | 191,517
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Equity securities, AFS | [1] | 11,815 | 12,262
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities | [1] | 4,797,385 | 4,365,501
Equity securities, AFS | [1] | 0 | 0
Total AFS securities | [1] | 4,797,385 | 4,365,501
Short-term investments | [1] | 0 | 0
Total assets measured at fair value | [1] | 4,797,385 | 4,365,501
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government and Government Agencies [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities | [1] | 54,744 | 61,413
Significant Other Observable Inputs (Level 2) [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities | [1] | 9,484 | 15,181
Significant Other Observable Inputs (Level 2) [Member] | Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities | [1] | 1,446,896 | 1,359,142
Significant Other Observable Inputs (Level 2) [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities | [1] | 2,196,118 | 1,900,182
Significant Other Observable Inputs (Level 2) [Member] | Asset-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities | [1] | 284,453 | 244,154
Significant Other Observable Inputs (Level 2) [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities | [1] | 266,774 | 243,592
Significant Other Observable Inputs (Level 2) [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities | [1] | 538,916 | 541,837
Significant Other Observable Inputs (Level 2) [Member] | Common Stock [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Equity securities, AFS | [1] | 0 | 0
Significant Other Observable Inputs (Level 2) [Member] | Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Equity securities, AFS | [1] | 0 | 0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 0 | 0
Equity securities, AFS |  | 7,676 | 3,272
Total AFS securities |  | 7,676 | 3,272
Short-term investments |  | 0 | 0
Total assets measured at fair value |  | 7,676 | 3,272
Significant Unobservable Inputs (Level 3) [Member] | U.S. Government and Government Agencies [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 0 | 0
Significant Unobservable Inputs (Level 3) [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 0 | 0
Significant Unobservable Inputs (Level 3) [Member] | Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 0 | 0
Significant Unobservable Inputs (Level 3) [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 0 | 0
Significant Unobservable Inputs (Level 3) [Member] | Asset-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 0 | 0
Significant Unobservable Inputs (Level 3) [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 0 | 0
Significant Unobservable Inputs (Level 3) [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 0 | 0
Significant Unobservable Inputs (Level 3) [Member] | Common Stock [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Equity securities, AFS |  | 7,676 | 3,272
Significant Unobservable Inputs (Level 3) [Member] | Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Equity securities, AFS |  | $ 0 | $ 0
[1] | 1 There were no transfers of securities between Level 1 and Level 2.

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