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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax provision (benefit) | $ 7,742 | $ 7,652 | $ 7,432 | $ 5,117 |
Effective income tax rate | 26.60% | (40.10%) | 27.70% | (20.80%) |
Provisional discrete net tax benefit recorded as result of changes in tax law |  |  |  |  | $ 73,500
Provisional net tax expense for one-time transition tax recorded as result of changes in tax law |  |  |  |  | 1,400
Provisional net tax benefit recorded for revaluation of deferred tax assets and liabilities as result of changes in tax law |  |  |  |  | $ 74,900

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