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Income Taxes (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Mar. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Provision for income taxes | $ 26,889,000 | $ 30,019,000 | $ 87,678,000 | $ 88,160,000 |  |
Effective tax rate | 20.20% | 26.40% | 21.90% | 26.60% |  |
Deferred tax liability, provisional income tax benefit |  |  |  |  | $ 40,600,000 |
Accumulated foreign earnings, provisional liability | $ 30,400,000 |  | $ 30,400,000 |  | 30,300,000 |
Transition tax for accumulated foreign earnings, increase (decrease) in provisional income tax expense |  |  | 100,000 |  |  |
Transition tax liability |  |  |  |  |  | $ 6,400,000
Provisional increase, deferred tax liability, income tax (expense) benefit | 7,800,000 |  |  |  | 9,200,000 |
Adjustment, deferred income tax expense (benefit) | 1,400,000 |  |  |  | 9,200,000 |
Permanent reinvestment, deferred tax liability, income tax (expense) benefit |  |  |  |  | $ 10,800,000 |
Minimum |  |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |  |
Reasonably possible change in unrecognized tax benefits over next 12 months | 0 |  | 0 |  |  |
Maximum |  |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |  |
Reasonably possible change in unrecognized tax benefits over next 12 months | $ 1,300,000 |  | $ 1,300,000 |  |  |

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