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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Dec. 31, 2017
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Operating Loss Carryforwards [Line Items]          
Combined effects of tax reform   $ (9,280) $ 86,044 $ 0  
Income Tax Charge (Benefit) to Adjust the Toll Tax Charge   $ (15,000) $ 80,900    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00% 21.00% 28.10%    
Final toll tax charge   $ 71,200      
Overstatement of deferred tax assets       8,200  
Income Tax (Textual) [Abstract]          
Valuation Allowance Adjustment   (1,473) $ (90,817) 5,163  
Operating Loss Carryforwards, Valuation Allowance   9,700      
Change In Permanent Reinvestment Assertion   6,093 0 0  
Tax Benefits associated with Net Operating Loss Carryforwards in Federal, State and Foreign Jurisdictions   28,886 39,884    
Tax Benefits that Do Not Expire   15,500      
Valuation Allowance   (14,614) (21,629)    
Change in Valuation Allowance, Current Year     $ 2,900    
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent     1.90%    
Deferred Tax Assets, Tax Credit Carryforwards   4,733 $ 644    
Unremitted Earnings of Non-U.S. Subsidiaries and Affiliates   1,400,000      
Unrecognized Tax Benefits that Would Impact Effective Tax Rate   9,000 5,800 2,600  
Increase (reduction) in Interest   (400) 700 200  
Interest Accrued   700 1,100    
Penalties Accrued   100      
Reasonably Possible amount of Unrecognized Tax Benefits within next 12 Months Could Decrease   400      
Unrecognized Tax Benefits, Period Increase (Decrease)   5,300      
Provisional tax expense for revaluation of U.S. net deferred taxes     5,100    
Deferred Tax Liabilities, Undistributed Foreign Earnings   3,900      
Expiring Year Fifteen Through Twenty [Member]          
Income Tax (Textual) [Abstract]          
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration   3,000      
Expiring Year Ten Through Fifteen [Member]          
Income Tax (Textual) [Abstract]          
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration   1,300      
Expiring Year Five Through Ten [Member]          
Income Tax (Textual) [Abstract]          
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration   1,700      
Expiring Through Year Five [Member]          
Income Tax (Textual) [Abstract]          
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration   7,400      
SEC Schedule, 12-09, Valuation Allowance, Operating Loss Carryforward [Member]          
Income Tax (Textual) [Abstract]          
Valuation Allowance Adjustment       $ 1,300  
Change in Valuation Allowance, Current Year         $ 105,900
Does not expire [Member]          
Income Tax (Textual) [Abstract]          
Deferred Tax Assets, Tax Credit Carryforwards   200      
Expiring Year Fifteen Through Twenty [Member]          
Income Tax (Textual) [Abstract]          
Deferred Tax Assets, Tax Credit Carryforwards   4,400      
Expiring Through Year Five [Member]          
Income Tax (Textual) [Abstract]          
Deferred Tax Assets, Tax Credit Carryforwards   100      
Income Tax Expense (Benefit) [Member]          
Income Tax (Textual) [Abstract]          
Quantifying Misstatement in Current Year Financial Statements, Amount     5,300    
Release of Australian valuation allowance [Member]          
Income Tax (Textual) [Abstract]          
Valuation Allowance Adjustment   1,100      
Release of U.S. valuation allowance [Member]          
Income Tax (Textual) [Abstract]          
Valuation Allowance Adjustment     $ 91,300    
Deferred Tax Asset Valuation Allowance [Member]          
Income Tax (Textual) [Abstract]          
Change in Valuation Allowance, Current Year   $ (7,000)