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Income Taxes Income Taxes - Effect of Income Taxes on Net Income and Stockholders' Equity (Details) - Successor [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Expense (Benefit) [Roll Forward] |  |  |
Income tax expense (benefit) | $ 44,464 | $ 30,709 | $ 17,364
Net Unrealized Losses On Securities Tax Effect | (30,838) | 41,602 | (55,906)
Valuation Allowances And Reserves Charged To Equity | 4,616 | 13,647 | (71,774)
Income Tax Effects Allocated Directly to Equity | 44,464 | 30,709 | 17,364
Unrealized Loss on FX Tax Effect | 25,776 | (58,527) | (15,628)
Change in Retirement Benefits Tax Effect | $ 446 | $ 3,278 | $ (240)

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- Definition The sum of the tax effects of all items occurring during the period that have been charged or credited directly to other comprehensive income or to related components of shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=79507043&loc=d3e39076-109324 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32672-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (d),(e) -URI http://asc.fasb.org/extlink&oid=79507043&loc=d3e38679-109324 + Details
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