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Income Taxes - Interest and Penalties Related to Liabilities for Income Tax Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]    
Interest expense $ 3,037 $ 2,086
Penalties expense (recoveries) 492 81
Total $ 3,529 $ 2,167