Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Deferred Income Tax Expense (Benefit)
Total income tax expense	$ 7,423	$ (12,882)
Reconciliation of the company's federal statutory tax rate to its effective rate
Effective income tax rate (as a percent)	35.90%	30.50%