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Fair Value Measurements (Quantitative Disclosures of Fair Value Assets) (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Available-for-sale Securities, Debt Securities |  | $ 4,192,818 | $ 4,066,122
Equity securities, AFS |  | 228,883 | 191,400
Total AFS securities |  | 4,421,701 | 4,257,522
Short-term investments |  | 168,349 | 131,972
Fair Value [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 4,192,818 | 4,066,122
Equity securities, AFS |  | 228,883 | 191,400
Total AFS securities |  | 4,421,701 | 4,257,522
Short-term investments |  | 168,349 | 131,972
Total assets measured at fair value |  | 4,590,050 | 4,389,494
Fair Value [Member] | U.S. Government and Government Agencies [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 115,861 | 124,130
Fair Value [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 22,719 | 27,831
Fair Value [Member] | Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 1,296,058 | 1,246,264
Fair Value [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 1,824,575 | 1,799,806
Fair Value [Member] | Asset-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 214,497 | 177,224
Fair Value [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 214,178 | 179,593
Fair Value [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 504,930 | 511,274
Fair Value [Member] | Common Stock [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Equity securities, AFS |  | 211,119 | 191,400
Fair Value [Member] | Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Equity securities, AFS |  | 17,764 |
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities | [1] | 52,361 | 53,199
Equity securities, AFS | [1] | 226,098 | 188,500
Total AFS securities | [1] | 278,459 | 241,699
Short-term investments | [1] | 168,349 | 131,972
Total assets measured at fair value | [1] | 446,808 | 373,671
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] | 52,361 | 53,199
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] | 208,334 | 188,500
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Equity securities, AFS | [1] | 17,764 |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities | [1] | 4,140,457 | 4,012,923
Equity securities, AFS | [1] | 0 | 0
Total AFS securities | [1] | 4,140,457 | 4,012,923
Short-term investments | [1] | 0 | 0
Total assets measured at fair value | [1] | 4,140,457 | 4,012,923
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] | 63,500 | 70,931
Significant Other Observable Inputs (Level 2) [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities | [1] | 22,719 | 27,831
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] | 1,296,058 | 1,246,264
Significant Other Observable Inputs (Level 2) [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities | [1] | 1,824,575 | 1,799,806
Significant Other Observable Inputs (Level 2) [Member] | Asset-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities | [1] | 214,497 | 177,224
Significant Other Observable Inputs (Level 2) [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities | [1] | 214,178 | 179,593
Significant Other Observable Inputs (Level 2) [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities | [1] | 504,930 | 511,274
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 |
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale Securities, Debt Securities |  | 0 | 0
Equity securities, AFS |  | 2,785 | 2,900
Total AFS securities |  | 2,785 | 2,900
Short-term investments |  | 0 | 0
Total assets measured at fair value |  | 2,785 | 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
Significant Unobservable Inputs (Level 3) [Member] | Common Stock [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Equity securities, AFS |  | 2,785 | $ 2,900
Significant Unobservable Inputs (Level 3) [Member] | Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Equity securities, AFS |  | $ 0 |
[1] | 1 There were no transfers of securities between Level 1 and Level 2.

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