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Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($) | Jun. 30, 2019 | Dec. 31, 2018
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | $ 5,534,270,000 | $ 7,515,318,000
Mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 586,758,000 | 787,441,000
Other, including U.S. Treasury securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 566,437,000 | 833,542,000
Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 1,599,693,000 | 2,003,969,000
Foreign government bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 47,367,000 | 84,904,000
Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 1,321,286,000 | 2,079,510,000
Other mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 1,412,729,000 | 1,725,952,000
Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 5,906,788,000 | 7,765,437,000
Separate Account (variable annuity) assets | 2,310,886,000 | 2,001,128,000
Investment contract and life policy reserves, embedded derivatives | 940,000 | 248,000
Other policyholder funds, embedded derivatives | 85,961,000 | 78,700,000
Carrying Amount | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 5,534,270,000 | 7,515,318,000
Carrying Amount | Short-term investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 247,872,000 | 122,222,000
Carrying Amount | Mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 586,758,000 | 787,441,000
Carrying Amount | Other, including U.S. Treasury securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 566,437,000 | 833,542,000
Carrying Amount | Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 1,599,693,000 | 2,003,969,000
Carrying Amount | Foreign government bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 47,367,000 | 84,904,000
Carrying Amount | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 1,321,286,000 | 2,079,510,000
Carrying Amount | Other mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 1,412,729,000 | 1,725,952,000
Carrying Amount | Equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 100,143,000 | 111,750,000
Carrying Amount | Other investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 24,503,000 | 16,147,000
Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 5,906,788,000 | 7,765,437,000
Separate Account (variable annuity) assets | 2,310,886,000 | 2,001,128,000
Investment contract and life policy reserves, embedded derivatives | 940,000 | 248,000
Other policyholder funds, embedded derivatives | 85,961,000 | 78,700,000
Fair Value | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 5,534,270,000 | 7,515,318,000
Fair Value | Short-term investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 247,872,000 | 122,222,000
Fair Value | Mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 586,758,000 | 787,441,000
Fair Value | Other, including U.S. Treasury securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 566,437,000 | 833,542,000
Fair Value | Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 1,599,693,000 | 2,003,969,000
Fair Value | Foreign government bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 47,367,000 | 84,904,000
Fair Value | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 1,321,286,000 | 2,079,510,000
Fair Value | Other mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 1,412,729,000 | 1,725,952,000
Fair Value | Equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 100,143,000 | 111,750,000
Fair Value | Other investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 24,503,000 | 16,147,000
Fair Value | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 334,687,000 | 207,198,000
Separate Account (variable annuity) assets | 2,310,886,000 | 2,001,128,000
Investment contract and life policy reserves, embedded derivatives | 0 | 0
Other policyholder funds, embedded derivatives | 0 | 0
Fair Value | Level 1 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 30,285,000 | 25,572,000
Fair Value | Level 1 | Short-term investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 246,872,000 | 117,296,000
Fair Value | Level 1 | Mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 0 | 0
Fair Value | Level 1 | Other, including U.S. Treasury securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 16,288,000 | 13,291,000
Fair Value | Level 1 | Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 0 | 0
Fair Value | Level 1 | Foreign government bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 0 | 0
Fair Value | Level 1 | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 13,997,000 | 12,281,000
Fair Value | Level 1 | Other mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 0 | 0
Fair Value | Level 1 | Equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 57,530,000 | 64,330,000
Fair Value | Level 1 | Other investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 0 | 0
Fair Value | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 5,317,388,000 | 7,309,750,000
Separate Account (variable annuity) assets | 0 | 0
Investment contract and life policy reserves, embedded derivatives | 940,000 | 248,000
Other policyholder funds, embedded derivatives | 0 | 0
Fair Value | Level 2 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 5,249,341,000 | 7,241,262,000
Fair Value | Level 2 | Short-term investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 1,000,000 | 4,926,000
Fair Value | Level 2 | Mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 584,070,000 | 784,224,000
Fair Value | Level 2 | Other, including U.S. Treasury securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 550,149,000 | 820,251,000
Fair Value | Level 2 | Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 1,552,709,000 | 1,956,438,000
Fair Value | Level 2 | Foreign government bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 47,367,000 | 84,904,000
Fair Value | Level 2 | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 1,228,067,000 | 1,986,487,000
Fair Value | Level 2 | Other mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 1,286,979,000 | 1,608,958,000
Fair Value | Level 2 | Equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 42,544,000 | 47,415,000
Fair Value | Level 2 | Other investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 24,503,000 | 16,147,000
Fair Value | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 254,713,000 | 248,489,000
Separate Account (variable annuity) assets | 0 | 0
Investment contract and life policy reserves, embedded derivatives | 0 | 0
Other policyholder funds, embedded derivatives | 85,961,000 | 78,700,000
Fair Value | Level 3 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 254,644,000 | 248,484,000
Fair Value | Level 3 | Short-term investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 0 | 0
Fair Value | Level 3 | Mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 2,688,000 | 3,217,000
Fair Value | Level 3 | Other, including U.S. Treasury securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 0 | 0
Fair Value | Level 3 | Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 46,984,000 | 47,531,000
Fair Value | Level 3 | Foreign government bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 0 | 0
Fair Value | Level 3 | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 79,222,000 | 80,742,000
Fair Value | Level 3 | Other mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 125,750,000 | 116,994,000
Fair Value | Level 3 | Equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | 69,000 | 5,000
Fair Value | Level 3 | Other investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of issued securities | $ 0 | $ 0

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