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Fair Value Measurements (Quantitative Disclosures of Fair Value Assets) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Available-for-sale Securities, Debt Securities | $ 3,967,638 |  | $ 3,715,536 |
Equity securities, AFS | 211,266 |  | 192,771 |
Total AFS securities | 4,178,904 |  | 3,908,307 |
Short-term investments | 181,593 |  | 174,251 |
Fair Value [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Securities, Debt Securities | 3,967,638 |  | 3,715,536 |
Equity securities, AFS | 211,266 |  | 192,771 |
Total AFS securities | 4,178,904 |  | 3,908,307 |
Short-term investments | 181,593 |  | 174,251 |
Total assets measured at fair value | 4,360,497 |  | 4,082,558 |
Fair Value [Member] | U.S. Government and Government Agencies [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Securities, Debt Securities | 151,689 |  | 173,375 |
Fair Value [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Securities, Debt Securities | 27,867 |  | 30,615 |
Fair Value [Member] | Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Securities, Debt Securities | 1,229,234 |  | 951,624 |
Fair Value [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Securities, Debt Securities | 1,763,230 |  | 1,734,883 |
Fair Value [Member] | Asset-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Securities, Debt Securities | 146,966 |  | 140,896 |
Fair Value [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Securities, Debt Securities | 165,518 |  | 171,284 |
Fair Value [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Securities, Debt Securities | 483,134 |  | 512,859 |
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Securities, Debt Securities | 51,467 | [1] | 52,153 | [1]
Equity securities, AFS | 208,366 | [1] | 189,871 | [1]
Total AFS securities | 259,833 | [1] | 242,024 | [1]
Short-term investments | 181,593 | [1] | 174,251 | [1]
Total assets measured at fair value | 441,426 | [1] | 416,275 | [1]
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 | 51,467 | [1] | 52,153 | [1]
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 | 0 | [1] | 0 | [1]
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 | 0 | [1] | 0 | [1]
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 | 0 | [1] | 0 | [1]
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 | 0 | [1] | 0 | [1]
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 | 0 | [1] | 0 | [1]
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 | 0 | [1] | 0 | [1]
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Securities, Debt Securities | 3,916,171 | [1] | 3,663,383 | [1]
Equity securities, AFS | 0 | [1] | 0 | [1]
Total AFS securities | 3,916,171 | [1] | 3,663,383 | [1]
Short-term investments | 0 | [1] | 0 | [1]
Total assets measured at fair value | 3,916,171 | [1] | 3,663,383 | [1]
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 | 100,222 | [1] | 121,222 | [1]
Significant Other Observable Inputs (Level 2) [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Securities, Debt Securities | 27,867 | [1] | 30,615 | [1]
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 | 1,229,234 | [1] | 951,624 | [1]
Significant Other Observable Inputs (Level 2) [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Securities, Debt Securities | 1,763,230 | [1] | 1,734,883 | [1]
Significant Other Observable Inputs (Level 2) [Member] | Asset-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Securities, Debt Securities | 146,966 | [1] | 140,896 | [1]
Significant Other Observable Inputs (Level 2) [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Securities, Debt Securities | 165,518 | [1] | 171,284 | [1]
Significant Other Observable Inputs (Level 2) [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Securities, Debt Securities | 483,134 | [1] | 512,859 | [1]
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Securities, Debt Securities | 0 |  | 0 |
Equity securities, AFS | 2,900 |  | 2,900 |
Total AFS securities | 2,900 |  | 2,900 |
Short-term investments | 0 |  | 0 |
Total assets measured at fair value | 2,900 |  | 2,900 |
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 |
[1] | 1 There were no transfers of securities between Level 1 and Level 2.

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