Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Jun. 30, 2012
Condensed Consolidated Balance Sheets [Abstract]
Accounts receivable, allowances for doubtful accounts	$ 1,027	$ 788
Property, plant and equipment, accumulated depreciation	$ 85,023	$ 74,242
Common stock, shares authorized	200,000,000	200,000,000
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares issued	45,600,471	45,548,902
Common stock, shares outstanding	45,600,471	45,548,902
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares issued
Preferred stock, shares outstanding
Treasury shares, shares outstanding	13,455,090	13,455,090