CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Shares and Additional Paid-in Capital Flow-through common shares	Common Shares and Additional Paid-in Capital	Accumulated Deficit	Noncontrolling Interest	Flow-through common shares	Total
Balance at Dec. 31, 2020		$ 1,548,876	$ (1,183,548)			$ 365,328
Balance (in shares) at Dec. 31, 2020		41,659
Increase (Decrease) in Shareholders' Equity
Stock-based compensation		$ 732				732
Sale of flow-through shares		$ 10,785				10,785
Sale of flow-through shares (in shares)		1,260
Sale of shares for cash		$ 29,875				29,875
Sale of shares for cash (in shares)		3,000
Issuance of equity by subsidiary (Note 18)		$ 25,086		$ 14,914		40,000
Net loss			(35,856)			(35,856)
Balance at Sep. 30, 2021		$ 1,615,354	(1,219,404)	14,914		410,864
Balance (in shares) at Sep. 30, 2021		45,919
Balance at Dec. 31, 2020		$ 1,548,876	(1,183,548)			365,328
Balance (in shares) at Dec. 31, 2020		41,659
Increase (Decrease) in Shareholders' Equity
Issuance of equity by subsidiary (Note 18)				14,900
Balance at Dec. 31, 2021		$ 1,615,596	(1,240,432)	14,777		389,941
Balance (in shares) at Dec. 31, 2021		45,919
Balance at Jun. 30, 2021		$ 1,589,974	(1,202,003)			387,971
Balance (in shares) at Jun. 30, 2021		45,919
Increase (Decrease) in Shareholders' Equity
Stock-based compensation		$ 294				294
Issuance of equity by subsidiary (Note 18)		25,086		14,914		40,000
Net loss			(17,401)			(17,401)
Balance at Sep. 30, 2021		$ 1,615,354	(1,219,404)	14,914		410,864
Balance (in shares) at Sep. 30, 2021		45,919
Balance at Dec. 31, 2021		$ 1,615,596	(1,240,432)	14,777		389,941
Balance (in shares) at Dec. 31, 2021		45,919
Increase (Decrease) in Shareholders' Equity
Issuance of equity by subsidiary (Note 18)				7,600
Balance at Jun. 30, 2022		$ 1,633,513	(1,273,614)	22,082		381,981
Balance (in shares) at Jun. 30, 2022		47,428
Balance at Dec. 31, 2021		$ 1,615,596	(1,240,432)	14,777		389,941
Balance (in shares) at Dec. 31, 2021		45,919
Increase (Decrease) in Shareholders' Equity
Stock-based compensation		$ 313				313
Sale of flow-through shares	$ 10,320				$ 10,320
Sale of flow-through shares (in shares)	1,450
Shares issued for debt refinancing		$ 500				500
Shares issued for debt refinancing (in shares)		59
Issuance of equity by subsidiary (Note 18)		$ 17,643		23,707		41,350
Share repurchase (Note 1)		(87)				(87)
Net loss			(43,712)	(300)		(44,012)
Balance at Sep. 30, 2022		$ 1,644,285	(1,284,144)	38,184		398,325
Balance (in shares) at Sep. 30, 2022		47,428
Balance at Jun. 30, 2022		$ 1,633,513	(1,273,614)	22,082		381,981
Balance (in shares) at Jun. 30, 2022		47,428
Increase (Decrease) in Shareholders' Equity
Stock-based compensation		$ 123				123
Issuance of equity by subsidiary (Note 18)		10,736		16,114		26,850
Share repurchase (Note 1)		(87)				(87)
Net loss			(10,530)	(12)		(10,542)
Balance at Sep. 30, 2022		$ 1,644,285	$ (1,284,144)	$ 38,184		$ 398,325
Balance (in shares) at Sep. 30, 2022		47,428