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Investments (Components of Net Investment Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment income, gross |  |  |  |  |  |  |  |  | $ 1,861,392 | $ 1,704,201 | $ 1,545,892
Less investment expenses |  |  |  |  |  |  |  |  | (11,520) | (12,009) | (14,225)
Net investment income | $ 475,633 | $ 463,583 | $ 459,830 | $ 450,826 | $ 438,262 | $ 436,085 | $ 418,176 | $ 399,669 | 1,849,872 | 1,692,192 | 1,531,667
Fixed Maturity Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment income, gross |  |  |  |  |  |  |  |  | 1,729,176 | 1,566,409 | 1,394,301
Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment income, gross |  |  |  |  |  |  |  |  | 531 | 441 | 404
Mortgage Loans on Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment income, gross |  |  |  |  |  |  |  |  | 122,985 | 131,892 | 143,998
Cash and Cash Equivalents [Member] |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment income, gross |  |  |  |  |  |  |  |  | 3,201 | 601 | 286
Other [Member] |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment income, gross |  |  |  |  |  |  |  |  | $ 5,499 | $ 4,858 | $ 6,903

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- Definition Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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- Definition Amount of expenses related to the generation of investment income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16(Column G)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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