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Goodwill and Other Intangibles (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Nov. 29, 2019
Goodwill and Other Intangibles        
Goodwill impairment $ 0 $ 0    
Provisional goodwill and intangibles related to Mayasa acquisition 0 123,960    
Amortization expense of amortizable intangible assets 5,300 300 $ 1,400  
Unfavorable Leases [Member]        
Goodwill and Other Intangibles        
Amortization benefit of unfavorable operating leases     $ 900  
Goodwill and acquisition intangibles [Member]        
Goodwill and Other Intangibles        
Provisional goodwill and intangibles related to Mayasa acquisition   128,100    
Goodwill [Member]        
Goodwill and Other Intangibles        
Residual goodwill       $ 73,400
Mayasa [Member]        
Goodwill and Other Intangibles        
Final purchase price allocation of intangibles related to Mayasa acquisition       61,500
Mayasa [Member] | Trade names [Member]        
Goodwill and Other Intangibles        
Indefinite-lived intangible assets acquired 36,000      
Mayasa [Member] | Non-compete agreements [Member]        
Goodwill and Other Intangibles        
Finite-lived intangible assets 4,700 100    
Mayasa [Member] | Trade names [Member]        
Goodwill and Other Intangibles        
Finite-lived intangible assets 8,500      
Mayasa [Member] | Other intangible assets [Member]        
Goodwill and Other Intangibles        
Finite-lived intangible assets $ 12,400      
Mayasa [Member] | Goodwill and acquisition intangibles [Member]        
Goodwill and Other Intangibles        
Provisional goodwill and intangibles related to Mayasa acquisition   $ 128,100    
Mayasa [Member] | Goodwill [Member]        
Goodwill and Other Intangibles        
Residual goodwill       $ 73,400