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Share Based Payments (Narrative) (Details)
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Dec. 31, 2019
USD ($)
EquityInstruments
$ / shares
shares
Dec. 31, 2018
$ / shares
$ / shares
Dec. 31, 2018
USD ($)
Y
EquityInstruments
$ / shares
Dec. 31, 2018
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Expense from share-based payment transactions with employees   $ 6,013,000   $ 3,701,000  
Granted, options   0   648,502  
Option life, share options granted | Y       3.00  
Description of expected forfeiture rate       5.57  
Expected dividend, share options granted       $ 0.00  
Description of option pricing model, share options granted       BlackScholes model  
Deferred, Restricted and Performance Share Units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Expense from share-based payment transactions with employees   $ 5,471,000   $ 2,343,000  
Restricted Share Units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Granted, other units | EquityInstruments   633,914   422,030  
Fair value per unit | (per share) $ 4.83 $ 3.62      
Performance Share Units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Granted, other units | EquityInstruments   422,609   1,002,166  
Fair value per unit | (per share) $ 4.83 $ 3.62 $ 6.20 $ 4.71  
Stock Options          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Expense from share-based payment transactions with employees   $ 542,000   $ 1,357,000  
Stock options available for issuance | shares 1,574,403 1,574,403      
Vesting Tranche One Period [member] | Performance Share Units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting tranche percentage sharebased arrangements   20.00%      
Vesting Tranche Two Period [member] | Performance Share Units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting tranche percentage sharebased arrangements   30.00%      
Vesting Tranche Three Period [member] | Performance Share Units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting tranche percentage sharebased arrangements   50.00%      
Bottom of range [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Risk free interest rate, share options granted       1.79%  
Expected volatility, share options granted       67.56%  
Fair value per share granted options | (per share)     $ 2.06 $ 2.06 $ 2.69
Bottom of range [member] | Restricted Share Units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Fair value per unit | (per share)     $ 6.20 $ 4.71  
Bottom of range [member] | Performance Share Units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting tranche percentage sharebased arrangements   50.00%      
Top of range [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Risk free interest rate, share options granted       1.90%  
Expected volatility, share options granted       68.16%  
Fair value per share granted options | (per share)     $ 2.38 $ 2.38 $ 3.09
Top of range [member] | Restricted Share Units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Fair value per unit | (per share)     $ 7.15 $ 5.54  
Top of range [member] | Performance Share Units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting tranche percentage sharebased arrangements   200.00%      
Top of range [member] | Stock Options          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Maximum issue of shares permitted | shares   12,200,000