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Share Based Payments (Schedule of Outstanding Units Activity) (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
EquityInstruments
Sep. 30, 2020
USD ($)
EquityInstruments
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
EquityInstruments
Deferred Share Units [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Outstanding, other than options, beginning   961,871 961,871 850,067
Granted, other units     162,648 111,804
Outstanding, other than options, ending     1,124,519 961,871
Outstanding, beginning balance, fair value   $ 3,918,000 $ 3,918,000 $ 3,116,000
Fair Value, granted, other units     383,000 455,000
Change in fair value, other units     4,938,000 347,000
Outstanding, ending balance, fair value     $ 9,239,000 $ 3,918,000
Cash Settled, Restricted Share Units [Member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Outstanding, other than options, beginning   392,435 392,435 659,385
Granted, other units     1,056,207 139,661
Paid, other units     (81,152) (406,611)
Outstanding, other than options, ending     1,367,490 392,435
Outstanding, beginning balance, fair value   $ 1,157,000 $ 1,157,000 $ 2,057,000
Fair Value, granted, other units     2,489,000 506,000
Fair Value, Paid in Cash, other units     (257,000) (1,466,000)
Change in fair value, other units     2,003,000 60,000
Outstanding, ending balance, fair value     5,392,000 $ 1,157,000
Fair value, Current portion     (3,128,000)  
Fair value, Non-current portion     $ 2,264,000  
Equity Settled, Restricted Share Units [Member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Outstanding, other than options, beginning   1,166,912 1,166,912 734,631
Granted, other units     815,220 633,914
Paid, other units     (448,766) (201,633)
Outstanding, other than options, ending     1,533,366 1,166,912
Performance Share Units        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Granted, other units | EquityInstruments 0 0   422,609
Equity Settled, Performance Share Units [Member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Outstanding, other than options, beginning   1,274,450 1,274,450 1,002,166
Granted, other units       422,609
Paid, other units     (243,782) (150,325)
Forfeited or cancelled, other units     (191,498)  
Outstanding, other than options, ending     839,170 1,274,450