INCOME TAXES: (Tables)

6 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Summary of income tax benefit (expense) and corresponding effective tax rates

A summary of income tax (expense) benefit and corresponding effective tax rates is as follows:

	For the Three Months Ended December 31,						For the Six Months Ended December 31,
	2018			2017			2018			2017
	(Dollars in thousands)
Income tax (expense) benefit	$	(454	)	$	80,825		$	260		$	75,266
Effective tax rate	52.1		%	208.7		%	85.0		%	304.4		%