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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2017
Income Taxes [Line Items]
Federal statutory income tax rate (percent)	28.00%		29.80%
Effective income tax rate	60.80%		55.30%
Transition tax on repatriation of foreign earnings	$ 9,300		$ 9,300
Provisional income tax expense	5,800
Gross unrecognized tax benefits	2,100		2,100		$ 2,200
Unrecognized tax benefits that would impact effective tax rate if recognized	1,400		1,400
Income tax penalties and interest accrued	1,200		1,200		$ 1,100
Income (loss) before income taxes	20,310	$ 35,781	$ 27,090	$ 58,505
Minimum [Member]
Income Taxes [Line Items]
Open tax year			2012
Internal Revenue Service (IRS) [Member]
Income Taxes [Line Items]
Revaluation of deferred taxes	(3,510)		$ (3,510)
Administration of the Treasury, Belgium [Member]
Income Taxes [Line Items]
Revaluation of deferred taxes	900		900
Income (loss) before income taxes	$ (1,700)		$ (800)

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