Condensed Consolidated Statements Of Changes In Equity - USD ($) $ in Thousands		Total		Common And Treasury Stock [Member]	Treasury Stock [Member]	Number Of Shares, Net Of Treasury [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Parent [Member]	Noncontrolling Interest [Member]
Balance, Number of Shares at Jun. 30, 2019				81,459,717	(24,891,292)	56,568,425
Balance at Jun. 30, 2019		$ 317,342		$ 80	$ (286,951)		$ 276,997	$ 523,028	$ (195,812)	$ 317,342	$ 0
Redeemable Common Stock, Balance at Jun. 30, 2019		107,672
Restricted stock granted, shares				568,000		568,000
Stock-based compensation charge (Note 13)		1,315					1,315			1,315
Reversal of stock-based compensation charge (Note 13)		(145)					(145)			(145)
Reversal of stock-based compensation charge (Note 13), shares				(17,500)		(17,500)
Stock based-compensation charge related to equity-accounted investment (Note 6)		71					71			71
Net loss		(39,478)						(39,478)		(39,478)	0
Other comprehensive (loss) income (Note 12)		$ (22,150)							(22,150)	(22,150)	0
Balance, Number of Shares at Mar. 31, 2020		57,118,925		82,010,217	(24,891,292)	57,118,925
Balance at Mar. 31, 2020		$ 256,955		$ 80	$ (286,951)		278,238	483,550	(217,962)	256,955	0
Redeemable Common Stock, Balance at Mar. 31, 2020		107,672
Balance, Number of Shares at Dec. 31, 2019				81,459,717	(24,891,292)	56,568,425
Balance at Dec. 31, 2019		318,473		$ 80	$ (286,951)		277,891	518,431	(190,978)	318,473	0
Redeemable Common Stock, Balance at Dec. 31, 2019		107,672
Restricted stock granted, shares				568,000		568,000
Stock-based compensation charge (Note 13)		492					492			492
Reversal of stock-based compensation charge (Note 13)		(145)					(145)			(145)
Reversal of stock-based compensation charge (Note 13), shares				(17,500)		(17,500)
Net loss		(34,881)						(34,881)		(34,881)	0
Other comprehensive (loss) income (Note 12)		$ (26,984)							(26,984)	(26,984)	0
Balance, Number of Shares at Mar. 31, 2020		57,118,925		82,010,217	(24,891,292)	57,118,925
Balance at Mar. 31, 2020		$ 256,955		$ 80	$ (286,951)		278,238	483,550	(217,962)	256,955	0
Redeemable Common Stock, Balance at Mar. 31, 2020		107,672
Balance, Number of Shares at Jun. 30, 2020				82,010,217	(24,891,292)	57,118,925
Balance at Jun. 30, 2020		290,213	[1]	$ 80	$ (286,951)		301,489	444,670	(169,075)	290,213	0
Redeemable Common Stock, Balance at Jun. 30, 2020	[1]	84,979
Exercise of stock option (Note 13)		$ 53		$ 0			53			53
Exercise of stock option (Note 13), shares		17,335		17,335		17,335
Stock-based compensation charge (Note 13)		$ 1,173					1,173			1,173
Reversal of stock-based compensation charge (Note 13)		(297)					(297)			(297)
Reversal of stock-based compensation charge (Note 13), shares				(510,200)		(510,200)
Stock based-compensation charge related to equity-accounted investment (Note 6)		(40)					(40)			(40)
Proceeds from disgorgement of shareholders' short-swing profits (Note 22)		98					98			98
Net loss		(39,696)						(39,696)		(39,696)	0
Other comprehensive (loss) income (Note 12)		$ 22,901							22,901	22,901	0
Balance, Number of Shares at Mar. 31, 2021		56,626,060		81,517,352	(24,891,292)	56,626,060
Balance at Mar. 31, 2021		$ 274,405		$ 80	$ (286,951)		302,476	404,974	(146,174)	274,405	0
Redeemable Common Stock, Balance at Mar. 31, 2021		84,979
Balance, Number of Shares at Dec. 31, 2020				81,505,851	(24,891,292)	56,614,559
Balance at Dec. 31, 2020		285,261		$ 80	$ (286,951)		302,196	411,178	(141,242)	285,261	0
Redeemable Common Stock, Balance at Dec. 31, 2020		84,979
Exercise of stock option (Note 13)		35		$ 0			35			35
Exercise of stock option (Note 13), shares				11,501		11,501
Stock-based compensation charge (Note 13)		245					245			245
Net loss		(6,204)						(6,204)		(6,204)	0
Other comprehensive (loss) income (Note 12)		$ (4,932)							(4,932)	(4,932)	0
Balance, Number of Shares at Mar. 31, 2021		56,626,060		81,517,352	(24,891,292)	56,626,060
Balance at Mar. 31, 2021		$ 274,405		$ 80	$ (286,951)		$ 302,476	$ 404,974	$ (146,174)	$ 274,405	$ 0
Redeemable Common Stock, Balance at Mar. 31, 2021		$ 84,979

[1] Derived from audited financial statements.