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Fair Value of Financial Instruments (Quantitative Information About Level 3 Fair Value Measurements) (Details) $ in Thousands | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Available-for-sale securities | $ 1,816,765 | $ 1,825,438
Nonredeemable preferred stocks | 193,263 | 206,685
Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Available-for-sale securities | 1,816,939 | 1,825,443
Nonredeemable preferred stocks | 193,263 | 206,685
Recurring | Asset-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Available-for-sale securities | 848 | 926
Recurring | Nonredeemable preferred stocks |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Nonredeemable preferred stocks | 595 | 595
Recurring | Financial services |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Nonredeemable preferred stocks | 53,228 | 69,577
Recurring | Financial services | Corporate bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Available-for-sale securities | 106,019 | 101,031
Recurring | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Available-for-sale securities | 998 | 1,176
Nonredeemable preferred stocks | 595 | 595
Recurring | Level 3 | Asset-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Available-for-sale securities | $ 848 | 926
Recurring | Level 3 | Asset-backed securities | Discounted cash flow | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Available-for-sale securities, range of weighted average significant unobservable inputs | 0.04 |
Recurring | Level 3 | Asset-backed securities | Discounted cash flow | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Available-for-sale securities, range of weighted average significant unobservable inputs | 0.06 |
Recurring | Level 3 | Nonredeemable preferred stocks |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Nonredeemable preferred stocks | $ 595 | 595
Recurring | Level 3 | Nonredeemable preferred stocks | Discounted cash flow | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Nonredeemable preferred stocks, range of weighted average significant unobservable inputs | 0.03 |
Recurring | Level 3 | Nonredeemable preferred stocks | Discounted cash flow | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Nonredeemable preferred stocks, range of weighted average significant unobservable inputs | 0.04 |
Recurring | Level 3 | Financial services |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Nonredeemable preferred stocks | $ 0 | 0
Recurring | Level 3 | Financial services | Corporate bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Available-for-sale securities | $ 150 | $ 250

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