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Leases (Summary of Amounts Recognized in Condensed Consolidated Balance Sheet) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Assets      
Operating lease assets $ 70,773 $ 0 $ 0
Finance lease assets 24,003    
Total leased assets 111,912    
Liabilities      
Current operating leases 24,544    
Non-current operating leases 47,299 0 0
Total operating lease liabilities 71,843    
Current finance leases [1] 17,331 0 0
Non-current finance leases [1] 21,925 $ 0 $ 0
Total finance lease liabilities 39,256    
Total lease liabilities 111,099    
Rail      
Assets      
Finance lease assets $ 17,136    
[1] See Note 14, Leases, for additional information. September 30, 2019 balances include the former build-to-suit lease that was reclassed from other current liabilities and other long-term liabilities as a result of the adoption of ASC 842.