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Income Taxes (Net Discrete Impact of Tax Act) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Mar. 31, 2018
Sep. 30, 2018
Income Taxes          
Transition Tax $ 7,589 $ 3,671 $ 14,778   $ 13,580
Impact on U.S. deferred tax assets and liabilities         (16,038)
Net changes in deferred tax liability associated with anticipated repatriation taxes         8,121
Total provision impact of the enactment of the Tax Act       $ 5,663  
Impact on the US net deferred tax assets from IS audit changes and tax return adjustments   5,197      
Income Tax Expense (Benefit) Related to Discrete Impacts in Tax Law   $ 3,671 $ 14,778   $ 10,860