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Assets Held for Sale Assets Held for Sale Major Classes of Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Disposal Group, Including Discontinued Operation, Allowance for Doubtful Accounts $ 5,000  
Disposal Group, Including Discontinued Operation, Assets 15,874 $ 0
Disposal Group, Including Discontinued Operation, Liabilities 1,813 $ 0
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Cash and cash equivalents 1,026  
Accounts and notes receivable-less allowances of $5 3,048  
Materials and supplies 2,922  
Other current assets 159  
Total current assets 7,155  
Goodwill 5,247  
Deferred Income Taxes 1,598  
Other property and investments-net and other non-current assets 1,874  
Disposal Group, Including Discontinued Operation, Assets 15,874  
Accounts payable 760  
Other current liabilities 901  
Total current liabilities 1,661  
Other non-current liabilities 152  
Disposal Group, Including Discontinued Operation, Liabilities $ 1,813