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Income Taxes Income Taxes - Effect of Income Taxes on Net Income and Stockholders' Equity (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Expense (Benefit) [Roll Forward]      
Income tax expense (benefit) $ 5,134 $ 44,464 $ 30,709
Net Unrealized Losses On Securities Tax Effect 11,832 (30,838) 41,602
Valuation Allowances And Reserves Charged To Equity (9,095) 4,616 (13,647)
Income Tax Effects Allocated Directly to Equity 2,527 0 0
Unrealized Loss on FX Tax Effect 0 25,776 (58,527)
Change in Retirement Benefits Tax Effect (371) 446 3,278
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Reclassification Adjustment from AOCI for Derecognition, Tax 161 0 0
Income Tax Effects Allocated Directly to Equity, Other $ 7,661 $ 44,464 $ 30,709