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		$ 439				439
Sale of shares for cash		$ 29,875				29,875
Sale of shares for cash (in shares)		3,000
Sale of flow-through common stock	$ 10,785				$ 10,785
Sale of flow-through common stock (in shares)	1,260
Net loss			(18,455)			(18,455)
Balance at Jun. 30, 2021		$ 1,589,975	(1,202,003)			387,972
Balance (in shares) at Jun. 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 Mar. 31, 2021		$ 1,589,763	(1,196,014)			393,749
Balance (in shares) at Mar. 31, 2021		45,919
Increase (Decrease) in Shareholders' Equity
Stock-based compensation		$ 212				212
Net loss			(5,989)			(5,989)
Balance at Jun. 30, 2021		$ 1,589,975	(1,202,003)			387,972
Balance (in shares) at Jun. 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
Balance at Mar. 31, 2022		$ 1,626,099	(1,261,162)	14,443		379,380
Balance (in shares) at Mar. 31, 2022		47,369
Increase (Decrease) in Shareholders' Equity
Out-of-period adjustment: Reclass from NCI to Accumulated Deficit			(1,403)	1,403
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		$ 190				190
Sale of flow-through common stock	$ 10,320				$ 10,320
Sale of flow-through common stock (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)		$ 6,907		7,593		14,500
Net loss			(33,182)	(288)		(33,470)
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 Mar. 31, 2022		$ 1,626,099	(1,261,162)	14,443		379,380
Balance (in shares) at Mar. 31, 2022		47,369
Increase (Decrease) in Shareholders' Equity
Stock-based compensation		$ 7				7
Shares issued for debt refinancing		$ 500				500
Shares issued for debt refinancing (in shares)		59
Issuance of equity by subsidiary (Note 18)		$ 6,907		7,593		14,500
Net loss			(12,452)	46		(12,406)
Balance at Jun. 30, 2022		$ 1,633,513	$ (1,273,614)	$ 22,082		$ 381,981
Balance (in shares) at Jun. 30, 2022		47,428