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Income Taxes - Schedule of Income Tax Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current: |  |  |
Federal | $ 24,300 | $ 40,300 | $ 26,700
State | 5,000 | 5,900 | 4,500
Total current | 29,300 | 46,200 | 31,200
Deferred: |  |  |
Federal | 18,400 | 2,900 | 11,100
State | 2,500 | 500 | 1,400
Total deferred | 20,917 | 3,369 | 12,449
Total income tax expense | $ 50,201 | $ 49,623 | $ 43,662

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