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Goodwill and Other Intangibles (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Other Intangibles      
Goodwill impairment $ 0 $ 0  
Increase in goodwill 1,464 18,202  
Provisional goodwill and intangibles related to Mayasa acquisition 128,090 0  
Increase in non-compete agreements 100 900  
Indefinite-lived intangible assets, other than goodwill 0 0  
Amortization expense of amortizable intangible assets   1,400 $ 1,600
Unfavorable Leases [Member]      
Goodwill and Other Intangibles      
Amortization benefit of unfavorable operating leases   $ 900 $ 1,500
Mayasa      
Goodwill and Other Intangibles      
Provisional goodwill and intangibles related to Mayasa acquisition $ 128,100