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Basis of Presentation - Income Taxes (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jul. 01, 2018
Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Increase to deferred tax assets $ 1,085,272   $ 1,122,729
Accounting Standards Update 2016-16      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of new accounting principle     26,780
Decrease in deferred costs   $ 38,000  
Increase to deferred tax assets   8,000  
Decrease to deferred credits   3,000  
Accounting Standards Update 2016-16 | Retained Earnings      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of new accounting principle   $ 27,000 $ 26,780