CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock	Capital in Excess of Par Value	(Accumulated Deficit) Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total
Balance at Jun. 30, 2015	$ 292	$ 93,807	$ 164,603	$ (7,096)	$ 251,606
Balance (in shares) at Jun. 30, 2015	29,147
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)			34,766		34,766
Other comprehensive income				771	771
Stock issued pursuant to employee stock incentive plans		113			113
Stock issued pursuant to employee stock incentive plans (in shares)	7
Issuance of restricted stock, net of forfeitures	$ 3	(3)
Issuance of restricted stock, net of forfeitures (in shares)	346
Dividends declared $0.24,$0.26 and $0.205 per share for June 30, 2016, 2017 and 2018, respectively			(7,170)		(7,170)
Share-based compensation		6,697			6,697
Exercise of stock options	$ 1	728			729
Exercise of stock options (in shares)	95
Sale of warrants		13,685			13,685
Purchase of call option (hedge)		(27,174)			(27,174)
Allocation of proceeds from convertible senior notes		27,241			27,241
Equity component of debt issuance costs		(976)			(976)
Deferred taxes related to convertible senior notes		330			330
Tax benefit from employee stock incentive plans		1,219			1,219
Balance at Jun. 30, 2016	$ 296	115,667	192,199	(6,325)	301,837
Balance (in shares) at Jun. 30, 2016	29,595
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)			11,376		11,376
Other comprehensive income				1,213	1,213
Stock issued pursuant to employee stock incentive plans		109			109
Stock issued pursuant to employee stock incentive plans (in shares)	5
Issuance of restricted stock, net of forfeitures	$ 4	(4)
Issuance of restricted stock, net of forfeitures (in shares)	424
Dividends declared $0.24,$0.26 and $0.205 per share for June 30, 2016, 2017 and 2018, respectively			(7,895)		(7,895)
Share-based compensation		6,930			6,930
Exercise of stock options	$ 1	550			551
Exercise of stock options (in shares)	70
Tax benefit from employee stock incentive plans		546			546
Stock to be issued in connection with acquisition of assets of Citron and Lucid		90,400			90,400
Balance at Jun. 30, 2017	$ 301	214,198	195,680	(5,112)	405,067
Balance (in shares) at Jun. 30, 2017	30,094
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)			(316,121)		(316,121)
Other comprehensive income				4,227	4,227
Stock issued pursuant to employee stock incentive plans		40			40
Stock issued pursuant to employee stock incentive plans (in shares)	2
Issuance of restricted stock, net of forfeitures	$ 6	(6)
Issuance of restricted stock, net of forfeitures (in shares)	595
Dividends declared $0.24,$0.26 and $0.205 per share for June 30, 2016, 2017 and 2018, respectively			(6,296)		(6,296)
Share-based compensation		7,762			7,762
Exercise of stock options	$ 1	605			606
Exercise of stock options (in shares)	96
Balance at Jun. 30, 2018	$ 308	$ 222,599	$ (126,737)	$ (885)	$ 95,285
Balance (in shares) at Jun. 30, 2018	30,787