Property, Plant and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017
Property, Plant and Equipment
Less accumulated depreciation	$ (76,809)		$ (71,461)
Property, plant and equipment, net before construction in progress	183,994		188,499
Property, plant and equipment, net	249,276		243,148
Depreciation expense	5,700	$ 5,100
Impairment expenses	0	$ 0
Held in foreign countries
Property, Plant and Equipment
Property, plant and equipment, net	1,000		1,000
Land
Property, Plant and Equipment
Property, plant and equipment, gross	6,191		6,191
Building and improvements
Property, Plant and Equipment
Property, plant and equipment, gross	108,740		108,730
Machinery and equipment
Property, Plant and Equipment
Property, plant and equipment, gross	142,885		142,086
Furniture and fixtures
Property, Plant and Equipment
Property, plant and equipment, gross	2,987		2,953
Construction in progress
Property, Plant and Equipment
Property, plant and equipment, net	$ 65,282		$ 54,649