INCOME TAXES: (Tables)

6 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

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

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

	For the Three Months Ended December 31,						For the Six Months Ended December 31,
	2017			2016			2017			2016
	(Dollars in thousands)
Income tax benefit (expense)	$	76,462		$	(719	)	$	71,630		$	(3,459	)
Effective tax rate	205.9		%	42.3		%	332.9		%	34.0		%