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Business (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Income Taxes [Abstract]    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate 21.00% 24.53%
Income Tax Reconciliation Change In Enacted Tax Rate $ 31,306  
Business Acquisition [Line Items]    
Minority Interest Ownership Percentage By Parent 80.00%  
MinorityInterestOwnershipPercentageByNoncontrollingOwners 20.00%  
Redeemable Noncontrolling Interest, Current Value $ 2,126  
New Accounting Pronouncements And Changes In Accounting Principles (Abstract)    
New Accounting Pronouncement Or Change In Accounting Principle Cumulative Effect Of Change On Equity Or Net Assets 1 $ 102