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Schedule II - Condensed Financial Information of Registrant (Condensed Balance Sheets) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Assets |  |  |  |
Cash and cash equivalents | $ 1,434,045 | $ 791,266 | $ 397,749 | $ 701,514
Deferred income taxes | 38,147 | 168,578 |  |
Other assets | 254,127 | 173,726 |  |
Total assets | 62,030,736 | 56,053,472 |  |
Liabilities: |  |  |  |
Notes and loan payable | 494,093 | 493,755 |  |
Federal income tax payable | 34,285 | 0 |  |
Other liabilities | 1,984,079 | 1,090,896 |  |
Total liabilities | 59,180,579 | 53,761,877 |  |
Stockholders' equity: |  |  |  |
Common stock | 89,331 | 88,001 |  |
Additional paid-in capital | 791,446 | 770,344 |  |
Accumulated other comprehensive income | 724,599 | 339,966 |  |
Retained earnings | 1,244,781 | 1,093,284 |  |
Total stockholders' equity | 2,850,157 | 2,291,595 | 1,944,535 | 2,139,876
Total liabilities and stockholders' equity | 62,030,736 | 56,053,472 |  |
Parent Company [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 22,486 | 36,394 | $ 38,903 | $ 61,139
Equity securities of subsidiary trusts | 7,429 | 7,422 |  |
Receivable from subsidiaries | 166 | 182 |  |
Deferred income taxes | 7,945 | 9,528 |  |
Federal income tax recoverable, including amount from subsidiaries | 1,059 | 0 |  |
Other assets | 1,566 | 2,540 |  |
Total assets, excluding investment in and advances to subsidiaries | 40,651 | 56,066 |  |
Investment in and advances to subsidiaries | 3,550,405 | 2,992,217 |  |
Total assets | 3,591,056 | 3,048,283 |  |
Liabilities: |  |  |  |
Notes and loan payable | 494,093 | 493,755 |  |
Subordinated debentures payable to subsidiary trusts | 242,565 | 241,853 |  |
Federal income tax payable | 0 | 3,614 |  |
Other liabilities | 4,241 | 17,466 |  |
Total liabilities | 740,899 | 756,688 |  |
Stockholders' equity: |  |  |  |
Common stock | 89,331 | 88,001 |  |
Additional paid-in capital | 791,446 | 770,344 |  |
Accumulated other comprehensive income | 724,599 | 339,966 |  |
Retained earnings | 1,244,781 | 1,093,284 |  |
Total stockholders' equity | 2,850,157 | 2,291,595 |  |
Total liabilities and stockholders' equity | $ 3,591,056 | $ 3,048,283 |  |

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- Definition Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due. This amount is the total of current and noncurrent accrued income taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(15)(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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