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Income Taxes (Details 2) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Income Tax Expense (Benefit) | $ 87,329 | $ 63,851 | $ 15,817
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 35.00% | 35.00%
Changes in Valuation and Qualifying Accounts |  |  |
Charges Utilized | $ (113,729) | $ (21,527) | $ 0
Tax Valuation Allowance |  |  |
Changes in Valuation and Qualifying Accounts |  |  |
Balance at Beginning of Period | 50,911 | 23,529 | 20,717
Charged (Credited) to Operations | 0 | 0 | 0
Charged to Other Account | 9,238 | 5,855 | 2,812
Charges Utilized | 0 | 0 | 0
Balance at End of Period | $ 173,878 | $ 50,911 | $ 23,529

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