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Leases (Summary of Amounts Recognized in Condensed Consolidated Balance Sheet) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Operating lease assets | $ 56,031 | $ 76,401
Finance lease assets | 25,921 | 23,723
Total leased assets | 97,776 | 117,589
Liabilities |  |
Current operating leases | 19,575 | 25,700
Non-current operating leases | 37,177 | 51,091
Total operating lease liabilities | 56,752 | 76,791
Current finance leases | 2,914 | 17,636
Non-current finance leases | 36,394 | 21,501
Total finance lease liabilities | 39,308 | 39,137
Total lease liabilities | $ 96,060 | $ 115,928
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | us-gaap:OtherLiabilitiesCurrent | us-gaap:OtherLiabilitiesCurrent
Rail |  |
Assets |  |
Finance lease assets | $ 15,824 | $ 17,465

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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