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Investments (Available-For-Sale Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Reclassifications from AOCI to net income (loss): |  |
Amortized Cost | $ 3,850,889 | $ 2,361,575
Total Fair Value | 3,904,136 | 2,457,531
U.S. Treasury obligations |  |
Reclassifications from AOCI to net income (loss): |  |
Amortized Cost | 241,696 | 104,097
Due in one year or less | 19,945 |
Due after one year through five years | 133,884 |
Due after five years through ten years | 86,726 |
Due after ten years | 2,150 |
Total Fair Value | 242,705 | 107,059
U.S. Government-sponsored enterprise obligations |  |
Reclassifications from AOCI to net income (loss): |  |
Amortized Cost | 20,509 | 12,103
Due in one year or less | 3,826 |
Due after one year through five years | 11,363 |
Due after five years through ten years | 5,134 |
Due after ten years | 145 |
Total Fair Value | 20,468 | 12,261
State and municipal bonds |  |
Reclassifications from AOCI to net income (loss): |  |
Amortized Cost | 513,111 | 316,022
Due in one year or less | 15,273 |
Due after one year through five years | 174,664 |
Due after five years through ten years | 188,717 |
Due after ten years | 144,053 |
Total Fair Value | 522,707 | 332,920
Corporate debt |  |
Reclassifications from AOCI to net income (loss): |  |
Amortized Cost | 1,928,543 | 1,267,992
Due in one year or less | 119,700 |
Due after one year through five years | 927,016 |
Due after five years through ten years | 809,889 |
Due after ten years | 106,508 |
Total Fair Value | 1,963,113 | 1,329,342
Residential mortgage-backed securities |  |
Reclassifications from AOCI to net income (loss): |  |
Amortized Cost | 475,368 | 269,752
Total Fair Value | 477,909 | 276,541
Agency commercial mortgage-backed securities |  |
Reclassifications from AOCI to net income (loss): |  |
Amortized Cost | 14,531 | 12,623
Total Fair Value | 14,942 | 13,310
Other commercial mortgage-backed securities |  |
Reclassifications from AOCI to net income (loss): |  |
Amortized Cost | 216,595 | 109,244
Total Fair Value | 219,024 | 113,092
Other asset-backed securities |  |
Reclassifications from AOCI to net income (loss): |  |
Amortized Cost | 440,536 | 269,742
Total Fair Value | $ 443,268 | $ 273,006

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