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Income Taxes (Details 2) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
United States |  |  |
Income Tax Examination [Line Items] |  |  |
Net Earnings | $ 585,912 |  |
Illinois |  |  |
Income Tax Examination [Line Items] |  |  |
Net Earnings | $ (1,844) |  |
North Carolina |  |  |
Income Tax Examination [Line Items] |  |  |
Net Earnings |  | $ 585 |
Connecticut |  |  |
Income Tax Examination [Line Items] |  |  |
Net Earnings |  |  | $ 1,616
Other Jurisdictions |  |  |
Income Tax Examination [Line Items] |  |  |
Net Earnings |  |  | $ 497

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