CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Total
Balance at Jun. 30, 2017	$ 37	$ 292,780	$ 277,774	$ (222)	$ (9,247)	$ 561,122
Balance (in shares) at Jun. 30, 2017	37,528
Increase (Decrease) in Shareholders' Equity
Shares issued in connection with share-based compensation plans	$ 1	3,578				3,579
Shares issued in connection with share-based compensation plans (in shares)	648
Share-based compensation		7,018				7,018
Purchase of treasury stock					(4,568)	(4,568)
Other comprehensive income (loss), net of tax				(228)		(228)
Net income (loss)			40,049			40,049
Balance at Mar. 31, 2018	$ 38	303,376	317,823	(450)	(13,815)	606,972
Balance (in shares) at Mar. 31, 2018	38,176
Balance at Dec. 31, 2017	$ 38	298,337	305,053	(347)	(10,285)	592,796
Balance (in shares) at Dec. 31, 2017	37,761
Increase (Decrease) in Shareholders' Equity
Shares issued in connection with share-based compensation plans		2,773				2,773
Shares issued in connection with share-based compensation plans (in shares)	415
Share-based compensation		2,266				2,266
Purchase of treasury stock					(3,530)	(3,530)
Other comprehensive income (loss), net of tax				(103)		(103)
Net income (loss)			12,770			12,770
Balance at Mar. 31, 2018	$ 38	303,376	317,823	(450)	(13,815)	606,972
Balance (in shares) at Mar. 31, 2018	38,176
Balance at Jun. 30, 2018	$ 38	306,817	306,464	(515)	(13,889)	598,915
Balance (in shares) at Jun. 30, 2018	38,257
Increase (Decrease) in Shareholders' Equity
Shares issued in connection with share-based compensation plans	$ 1	800				801
Shares issued in connection with share-based compensation plans (in shares)	601
Share-based compensation		6,974				6,974
Purchase of treasury stock					(531)	(531)
Other comprehensive income (loss), net of tax				(56)		(56)
Net income (loss)			(264,521)			(264,521)
Balance at Mar. 31, 2019	$ 39	314,591	39,661	(571)	(14,420)	339,300
Balance (in shares) at Mar. 31, 2019	38,858
Balance at Dec. 31, 2018	$ 39	312,322	29,016	(502)	(14,364)	326,511
Balance (in shares) at Dec. 31, 2018	38,767
Increase (Decrease) in Shareholders' Equity
Shares issued in connection with share-based compensation plans		280				280
Shares issued in connection with share-based compensation plans (in shares)	91
Share-based compensation		1,989				1,989
Purchase of treasury stock					(56)	(56)
Other comprehensive income (loss), net of tax				(69)		(69)
Net income (loss)			10,645			10,645
Balance at Mar. 31, 2019	$ 39	$ 314,591	39,661	$ (571)	$ (14,420)	339,300
Balance (in shares) at Mar. 31, 2019	38,858
Increase (Decrease) in Shareholders' Equity
ASC 606 adjustment | ASU 2014-09			$ (2,282)			$ (2,282)