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Lease Obligations (Schedule of Lease Obligations) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of finance lease and operating lease by lessee [line items]    
Total lease obligations $ 37,792 $ 9,656
Less: future finance charges (13,913) (890)
Present value of minimum lease payments 23,879 8,766
Current portion 8,831 3,395
Non-current portion 15,048 5,371
Less than one year    
Disclosure of finance lease and operating lease by lessee [line items]    
Total lease obligations 9,313 3,912
Between one and five years    
Disclosure of finance lease and operating lease by lessee [line items]    
Total lease obligations 13,521 $ 5,744
More than five years    
Disclosure of finance lease and operating lease by lessee [line items]    
Total lease obligations $ 14,958