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Income Taxes (Components of Income Tax Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Consolidated statements of operations: |  |  |
Current income taxes | $ 120,289 | $ 188,356 | $ 57,412
Deferred income taxes (benefits) | (12,563) | (46,730) | (10,408)
Total income tax expense included in consolidated statements of operations | 107,726 | 141,626 | 47,004
Stockholders' equity: |  |  |
Expense (benefit) relating to: Change in net unrealized investment losses | (240,459) | 177,162 | 74,471
Expense (benefit) relating to: Share-based compensation |  |  | (527)
Total income tax expense (benefit) included in consolidated financial statements | $ (132,733) | $ 318,788 | $ 120,948

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- Definition Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109245112&loc=d3e23524-113945 + Details
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