Goodwill and Intangible Assets - Future Annual Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2018
Goodwill and Intangible Assets
Amortization expense	$ 8,200	$ 8,200	$ 16,400	$ 16,300
Future annual amortization expense:
2019	15,224		15,224
2020	30,443		30,443
2021	30,443		30,443
2022	30,443		30,443
2023	30,443		30,443
Thereafter	236,425		236,425
Intangible assets, net	$ 373,421		$ 373,421		$ 387,976