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Condensed Financial Information of The Registrant (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |  |  |  |
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2006
Supplemental Condensed Financial Information Of The Registrant [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,806,524,000 | $ 2,808,770,000 |  |  |
Debt Issuance Cost |  |  |  |  |  |  |  |  |  |  |  |  | (18,651,000) | (20,405,000) |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  | 2,787,873,000 | 2,788,365,000 |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  | 39,992,346,000 | 38,150,820,000 |  |  |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  | 142,598,000 | 93,304,000 |  |  |
Cash and cash equivalents |  | $ 1,889,733,000 |  |  | $ 1,303,524,000 | $ 1,303,524,000 |  |  | $ 1,200,718,000 | $ 1,303,524,000 | $ 1,200,718,000 | $ 1,525,275,000 | 1,889,733,000 | 1,303,524,000 | $ 1,200,718,000 | $ 1,525,275,000 |
Other assets |  |  |  |  |  |  |  |  |  |  |  |  | 839,222,000 | 767,088,000 |  |  |
Total assets |  |  |  |  |  |  |  |  |  |  |  |  | 64,535,245,000 | 60,514,818,000 |  |  |
Liabilities and Stockholders’ Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other liabilities |  |  |  |  |  |  |  |  |  |  |  |  | 1,396,200,000 | 1,102,975,000 |  |  |
Total stockholders equity |  |  |  |  |  |  |  |  |  |  |  |  | 8,450,553,000 | 9,569,535,000 | 7,093,082,000 | 6,135,381,000 |
Total liabilities and stockholders’ equity |  |  |  |  |  |  |  |  |  |  |  |  | 64,535,245,000 | 60,514,818,000 |  |  |
CONSOLIDATED STATEMENTS OF INCOME |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total investment related gains (losses), net |  |  |  |  |  |  |  |  |  | (170,088,000) | 167,880,000 | 94,195,000 |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  | 129,978,000 | (679,366,000) | 342,503,000 |  |  |  |  |
Net Income (Loss) Attributable to Parent |  | 110,039,000 | $ 301,199,000 | $ 204,374,000 | 100,230,000 | 1,216,888,000 | $ 227,591,000 | $ 232,190,000 | 145,512,000 | 715,842,000 | 1,822,181,000 | 701,443,000 |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  |  | (1,424,295,000) | 767,930,000 | 431,045,000 |  |  |  |  |
Total comprehensive income (loss) |  |  |  |  |  |  |  |  |  | (708,453,000) | 2,590,111,000 | 1,132,488,000 |  |  |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 850,000,000.0
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent |  | 110,039,000 | $ 301,199,000 | $ 204,374,000 | 100,230,000 | 1,216,888,000 | $ 227,591,000 | $ 232,190,000 | 145,512,000 | 715,842,000 | 1,822,181,000 | 701,443,000 |  |  |  |  |
Other, net |  |  |  |  |  |  |  |  |  | (1,268,000) | 24,216,000 | 117,949,000 |  |  |  |  |
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  | 1,581,121,000 | 1,982,308,000 | 1,465,718,000 |  |  |  |  |
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales of fixed maturity securities available-for-sale |  |  |  |  |  |  |  |  |  | 9,339,632,000 | 7,308,608,000 | 4,584,828,000 |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  |  |  |  |  |  | (31,441,000) | 0 | 0 |  |  |  |  |
Payments for (Proceeds from) Short-term Investments |  |  |  |  |  |  |  |  |  | 129,329,000 | 52,302,000 | 465,628,000 |  |  |  |  |
Payments for (Proceeds from) Other Investing Activities |  |  |  |  |  |  |  |  |  | (365,242,000) | (121,206,000) | (97,790,000) |  |  |  |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  |  | (636,552,000) | (1,607,573,000) | (2,825,726,000) |  |  |  |  |
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  |  |  |  |  |  |  |  |  | (140,110,000) | (117,291,000) | (100,371,000) |  |  |  |  |
Purchases of treasury stock |  |  |  |  |  |  |  |  |  | (299,679,000) | (43,508,000) | (122,916,000) |  |  |  |  |
Excess tax benefits from share-based payment arrangement cash flow |  |  |  |  |  |  |  |  |  | 0 | 0 | 162,000 |  |  |  |  |
Exercise of stock options, net |  |  |  |  |  |  |  |  |  | 3,459,000 | 7,292,000 | 15,321,000 |  |  |  |  |
Maturities of Senior Debt |  |  |  |  |  |  |  |  |  | 2,690,000 | 302,582,000 | 2,479,000 |  |  |  |  |
Proceeds from affiliated long-term debt issuance |  |  |  |  |  |  |  |  |  | 0 | 0 | (799,984,000) |  |  |  |  |
Payments Of Debt Issuance Costs |  |  |  |  |  |  |  |  |  | 0 | 0 | (8,766,000) |  |  |  |  |
Net cash used in financing activities |  |  |  |  |  |  |  |  |  | (321,973,000) | (324,622,000) | 1,055,389,000 |  |  |  |  |
Change in cash and cash equivalents |  |  |  |  |  |  |  |  |  | 586,209,000 | 102,806,000 | (324,557,000) |  |  |  |  |
Cash and cash equivalents, beginning of period |  |  |  |  | 1,303,524,000 |  |  |  | 1,200,718,000 | 1,303,524,000 | 1,200,718,000 | 1,525,275,000 |  |  |  |  |
Cash and cash equivalents, end of period |  | 1,889,733,000 |  |  |  | 1,303,524,000 |  |  |  | 1,889,733,000 | 1,303,524,000 | 1,200,718,000 |  |  |  |  |
Supplementary information: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest paid |  |  |  |  |  |  |  |  |  | 170,191,000 | 173,471,000 | 156,727,000 |  |  |  |  |
Income taxes paid, net of refunds |  |  |  |  |  |  |  |  |  | 141,703,000 | 37,098,000 | 61,085,000 |  |  |  |  |
Cash Acquired from Acquisition |  |  |  |  |  |  |  |  |  | 4,988,000 | 0 | 0 |  |  |  |  |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Condensed Financial Information Of The Registrant [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  |  |  | 2,797,357,000 | 2,796,913,000 |  |  |
Debt Issuance Cost |  |  |  |  |  |  |  |  |  |  |  |  | (19,601,000) | (21,334,000) |  |  |
Long-term debt | [1] |  |  |  |  |  |  |  |  |  |  |  | 2,777,756,000 | 2,775,579,000 |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  | 595,303,000 | 710,303,000 |  |  |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  | 42,906,000 | 54,517,000 |  |  |
Cash and cash equivalents |  | 20,641,000 |  |  | 15,176,000 | 15,176,000 |  |  | 43,718,000 | 15,176,000 | 43,718,000 | 39,452,000 | 20,641,000 | 15,176,000 | $ 43,718,000 | $ 39,452,000 |
Investments In Subsidiary |  |  |  |  |  |  |  |  |  |  |  |  | 11,033,195,000 | 12,043,911,000 |  |  |
Loans and Leases Receivable, Related Parties |  |  |  |  |  |  |  |  |  |  |  |  | 1,010,000,000 | 1,010,000,000 |  |  |
Other assets |  |  |  |  |  |  |  |  |  |  |  |  | 239,643,000 | 234,707,000 |  |  |
Total assets |  |  |  |  |  |  |  |  |  |  |  |  | 12,941,688,000 | 14,068,614,000 |  |  |
Liabilities and Stockholders’ Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt - affiliated | [2] |  |  |  |  |  |  |  |  |  |  |  | 500,000,000 | 500,000,000 |  |  |
Other liabilities |  |  |  |  |  |  |  |  |  |  |  |  | 1,213,379,000 | 1,223,500,000 |  |  |
Total stockholders equity |  |  |  |  |  |  |  |  |  |  |  |  | 8,450,553,000 | 9,569,535,000 |  |  |
Total liabilities and stockholders’ equity |  |  |  |  |  |  |  |  |  |  |  |  | 12,941,688,000 | 14,068,614,000 |  |  |
CONSOLIDATED STATEMENTS OF INCOME |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest and Dividend Income, Operating | [3] |  |  |  |  |  |  |  |  | 575,833,000 | 131,067,000 | 602,830,000 |  |  |  |  |
Total investment related gains (losses), net |  |  |  |  |  |  |  |  |  | (5,392,000) | (5,187,000) | 203,000 |  |  |  |  |
Operating Expenses |  |  |  |  |  |  |  |  |  | (35,912,000) | (20,517,000) | (20,742,000) |  |  |  |  |
Interest and Debt Expense |  |  |  |  |  |  |  |  |  | (181,364,000) | (177,417,000) | (168,924,000) |  |  |  |  |
Income (loss) before income tax and undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  |  | 353,165,000 | (72,054,000) | 413,367,000 |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  | (37,294,000) | 65,882,000 | (23,911,000) |  |  |  |  |
Net income (loss) before undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  |  | 390,459,000 | (137,936,000) | 437,278,000 |  |  |  |  |
Equity In Undistributed Earnings Of Subsidiaries |  |  |  |  |  |  |  |  |  | 325,383,000 | 1,960,117,000 | 264,165,000 |  |  |  |  |
Net Income (Loss) Attributable to Parent |  |  |  |  |  |  |  |  |  | 715,842,000 | 1,822,181,000 | 701,443,000 |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  |  | 21,455,000 | (7,672,000) | 5,531,000 |  |  |  |  |
Total comprehensive income (loss) |  |  |  |  |  |  |  |  |  | 737,297,000 | 1,814,509,000 | 706,974,000 |  |  |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Dividends Received |  |  |  |  |  |  |  |  |  | 0 | 478,602,000 | 196,445,000 |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  | 500,000,000 | 500,000,000 |  |  |
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent |  |  |  |  |  |  |  |  |  | 715,842,000 | 1,822,181,000 | 701,443,000 |  |  |  |  |
Equity Net Earnings Subsidiaries |  |  |  |  |  |  |  |  |  | (325,383,000) | (1,960,117,000) | (264,165,000) |  |  |  |  |
Other, net |  |  |  |  |  |  |  |  |  | 36,754,000 | 57,677,000 | (63,795,000) |  |  |  |  |
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  | 427,213,000 | (80,259,000) | 373,483,000 |  |  |  |  |
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales of fixed maturity securities available-for-sale |  |  |  |  |  |  |  |  |  | 482,324,000 | 514,508,000 | 228,383,000 |  |  |  |  |
Purchases of fixed maturity securities available-for-sale |  |  |  |  |  |  |  |  |  | (383,392,000) | (75,000,000) | (984,397,000) |  |  |  |  |
Purchases Of Subsidiary Debt Securities |  |  |  |  |  |  |  |  |  | 0 | 40,000,000 | 20,000,000 |  |  |  |  |
Payments for (Proceeds from) Short-term Investments |  |  |  |  |  |  |  |  |  | 0 | 0 | 102,508,000 |  |  |  |  |
Payments for (Proceeds from) Other Investing Activities |  |  |  |  |  |  |  |  |  | 44,000 | 125,506,000 | (109,914,000) |  |  |  |  |
Capital Contributions To Subsidiaries |  |  |  |  |  |  |  |  |  | (82,150,000) | (62,500,000) | (314,142,000) |  |  |  |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  |  | 16,826,000 | 542,514,000 | (1,057,562,000) |  |  |  |  |
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  |  |  |  |  |  |  |  |  | (140,110,000) | (117,291,000) | (100,371,000) |  |  |  |  |
Purchases of treasury stock |  |  |  |  |  |  |  |  |  | (299,679,000) | (43,508,000) | (122,916,000) |  |  |  |  |
Exercise of stock options, net |  |  |  |  |  |  |  |  |  | 3,459,000 | 7,292,000 | 15,321,000 |  |  |  |  |
Net Change In Cash Collateral For Loaned Securities |  |  |  |  |  |  |  |  |  | (2,244,000) | (37,290,000) | 105,093,000 |  |  |  |  |
Maturities of Senior Debt |  |  |  |  |  |  |  |  |  | 0 | (300,000,000) | 0 |  |  |  |  |
Proceeds from affiliated long-term debt issuance |  |  |  |  |  |  |  |  |  | 0 | 0 | (799,984,000) |  |  |  |  |
Payments Of Debt Issuance Costs |  |  |  |  |  |  |  |  |  | 0 | 0 | (8,766,000) |  |  |  |  |
Net cash used in financing activities |  |  |  |  |  |  |  |  |  | (438,574,000) | (490,797,000) | 688,345,000 |  |  |  |  |
Change in cash and cash equivalents |  |  |  |  |  |  |  |  |  | 5,465,000 | (28,542,000) | 4,266,000 |  |  |  |  |
Cash and cash equivalents, beginning of period |  |  |  |  | $ 15,176,000 |  |  |  | $ 43,718,000 | 15,176,000 | 43,718,000 | 39,452,000 |  |  |  |  |
Cash and cash equivalents, end of period |  | $ 20,641,000 |  |  |  | $ 15,176,000 |  |  |  | 20,641,000 | 15,176,000 | 43,718,000 |  |  |  |  |
Supplementary information: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest paid |  |  |  |  |  |  |  |  |  | 176,236,000 | 185,554,000 | 169,860,000 |  |  |  |  |
Income taxes paid, net of refunds |  |  |  |  |  |  |  |  |  | 93,000,000 | 8,248,000 | 1,500,000 |  |  |  |  |
Cash Acquired from Acquisition |  |  |  |  |  |  |  |  |  | 0 | $ 0 | $ 529,000 |  |  |  |  |
Senior Notes Due 2017 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 5.625% |  |  |  |
Senior Notes Due 2017 [Member] | Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  | 300,000,000 |  |  |  |  |  |  |
Senior Notes Due 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Condensed Financial Information Of The Registrant [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  |  |  | $ 399,941,000 | 399,873,000 |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 6.45% |  |  |  |
Senior Notes Due 2019 [Member] | Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Condensed Financial Information Of The Registrant [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  |  |  | $ 399,941,000 | 399,873,000 |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  | $ 400,000,000 |  |  |  |  |  |  |
Senior Notes Due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Condensed Financial Information Of The Registrant [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  |  |  | 399,466,000 | 399,245,000 |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |
Senior Notes Due 2021 [Member] | Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Condensed Financial Information Of The Registrant [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  |  |  | $ 399,466,000 | 399,245,000 |  |  |
Senior Notes Due 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Condensed Financial Information Of The Registrant [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  |  |  | 399,288,000 | 399,138,000 |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 4.70% |  |  |  |
Senior Notes Due 2023 [Member] | Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Condensed Financial Information Of The Registrant [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  |  |  | $ 399,289,000 | 399,138,000 |  |  |
Senior Notes Due 2026 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Condensed Financial Information Of The Registrant [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  |  |  | 399,988,000 | 399,987,000 |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 3.95% |  |  |  |
Senior Notes Due 2026 [Member] | Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Condensed Financial Information Of The Registrant [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  |  |  | $ 399,987,000 | 399,987,000 |  |  |
Subordinated Debentures Due 2042 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Condensed Financial Information Of The Registrant [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  |  |  | 400,000,000 | 400,000,000 |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 6.20% |  |  |  |
Subordinated Debentures Due 2042 [Member] | Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Condensed Financial Information Of The Registrant [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 | 400,000,000 |  |  |
Subordinated Debentures Due 2056 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Condensed Financial Information Of The Registrant [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  |  |  | 400,000,000 | 400,000,000 |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 5.75% |  |  |  |
Subordinated Debentures Due 2056 [Member] | Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Condensed Financial Information Of The Registrant [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 | 400,000,000 |  |  |
Junior Subordinated Debentures Due 2065 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Condensed Financial Information Of The Registrant [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  |  |  | 318,743,000 | 318,740,000 |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 4.82% |  |  |  |
Junior Subordinated Debentures Due 2065 [Member] | Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Condensed Financial Information Of The Registrant [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  |  |  | $ 398,674,000 | $ 398,670,000 |  |  |
[1] | Long-term debt - unaffiliated consists of the following: 2018 2017$400 million 6.45% Senior Notes due 2019 $399,941 $399,873$400 million 5.00% Senior Notes due 2021 399,466 399,245$400 million 4.70% Senior Notes due 2023 399,289 399,138$400 million 3.95% Senior Notes due 2026 399,987 399,987$400 million 6.20% Subordinated Debentures due 2042 400,000 400,000$400 million 5.75% Subordinated Debentures due 2056 400,000 400,000$400 million Variable Rate Junior Subordinated Debentures due 2065 398,674 398,670Subtotal 2,797,357 2,796,913Unamortized debt issue costs (19,601) (21,334)Total $2,777,756 $2,775,579Repayments of long-term debt—unaffiliated due over the next five years total $400,000 in 2019, $400,000 in 2021 and $400,000 in 2023.
[2] | Long-term debt—affiliated in 2018 and 2017 and consists of $500,000 of subordinated debt issued to various operating subsidiaries.
[3] | Interest/dividend income includes $450,000 and $478,602 of cash dividends received from consolidated subsidiaries in 2018 and 2016, respectively. In 2017 there were no cash dividends received from consolidated subsidiaries.

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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