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Fair Value Measurements (Quantitative Disclosures of Fair Value Assets) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Available-for-sale Securities, Debt Securities |  | $ 4,600,468 | $ 4,408,203
Equity securities, AFS |  | 215,789 | 207,051
Total AFS securities |  | 4,816,257 | 4,615,254
Short-term investments |  | 103,132 | 194,819
Fair Value [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 4,600,468 | 4,408,203
Equity securities, AFS |  | 215,789 | 207,051
Total AFS securities |  | 4,816,257 | 4,615,254
Short-term investments |  | 103,132 | 194,819
Total assets measured at fair value |  | 4,919,389 | 4,810,073
Fair Value [Member] | U.S. Government and Government Agencies [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 102,618 | 104,115
Fair Value [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 13,742 | 15,181
Fair Value [Member] | Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 1,435,315 | 1,359,142
Fair Value [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 1,987,956 | 1,900,182
Fair Value [Member] | Asset-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 245,817 | 244,154
Fair Value [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 252,892 | 243,592
Fair Value [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 562,128 | 541,837
Fair Value [Member] | Common Stock [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Equity securities, AFS |  | 202,619 | 194,789
Fair Value [Member] | Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Equity securities, AFS |  | 13,170 | 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] | 42,570 | 42,702
Equity securities, AFS | [1] | 212,517 | 203,779
Total AFS securities | [1] | 255,087 | 246,481
Short-term investments | [1] | 103,132 | 194,819
Total assets measured at fair value | [1] | 358,219 | 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] | 42,570 | 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] | 199,347 | 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] | 13,170 | 12,262
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities | [1] | 4,557,898 | 4,365,501
Equity securities, AFS | [1] | 0 | 0
Total AFS securities | [1] | 4,557,898 | 4,365,501
Short-term investments | [1] | 0 | 0
Total assets measured at fair value | [1] | 4,557,898 | 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] | 60,048 | 61,413
Significant Other Observable Inputs (Level 2) [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities | [1] | 13,742 | 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] | 1,435,315 | 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] | 1,987,956 | 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] | 245,817 | 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] | 252,892 | 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] | 562,128 | 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 |  | 3,272 | 3,272
Total AFS securities |  | 3,272 | 3,272
Short-term investments |  | 0 | 0
Total assets measured at fair value |  | 3,272 | 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 |  | 3,272 | 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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