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Warrants (Narrative) (Details)
 12 Months Ended
Dec. 31, 2019
Warrant
$ / shares
shares
Dec. 31, 2018
Warrant
$ / shares
shares
Dec. 31, 2017
Warrant
$ / shares
Statements Line Items      
Weighted average exercise price of warrants issued during period $ 19.08 $ 0  
Number of warrants expired during period | shares 5,715,500 0  
Warrants outstanding, weighted average exercise price $ 36.50 $ 27.61 $ 27.61
Warrants outstanding | Warrant 5,480,000 11,195,500 11,195,500