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Discontinued Operations Results Of Discontinued Operations (Details) - USD ($)
$ in Thousands
 2 Months Ended 3 Months Ended 12 Months Ended
Mar. 01, 2017
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Capital Expenditures                 $ 265,730 $ 250,027 $ 179,090
Purchases under supply agreement                 30,000 24,000 42,000
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]                      
Impairment on net assets of discontinued operations   $ 2,000 $ (4,000) $ 33,000 $ 15,000       47,000 35,682  
Net income (loss) from discontinued operations           $ 4,000     1,619 (4,397) (6,746)
Deferred income taxes                 7,109 (2,180) (46,537)
DCO Footnote 2 [Abstract]                      
Payments to Acquire Equity Method Investments                 7,594 60,300 7,664
PGW                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Cash Provided by (Used in) Operating Activities, Discontinued Operations $ (4,000)                    
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]                      
Disposal Group, Including Discontinued Operation, Revenue                 0 0 111,130
Disposal Group, Including Discontinued Operation, Costs of Goods Sold                 0 0 100,084
Disposal Group, Including Discontinued Operation, General and Administrative Expense                 1,626 0 8,369
Disposal Group, Including Discontinued Operation, Operating Income (Loss)                 (1,626) 0 2,677
Disposal Group, Including Discontinued Operation, Other Expense                 0 0 1,204
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax                 (1,626) 0 3,881
Discontinued Operation, Tax Effect of Discontinued Operation                 (1,572) 0 3,598
disposal group, including discontinued operation, equity in earnings                 0 0 (534)
IncomeLossFromDiscontinuedOperationsExcludingLossOnSaleNetOfTaxAttributableToReportingEntity                 (54) 0 (251)
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax                 0 (4,397) (6,495)
Net income (loss) from discontinued operations                 $ (54) $ (4,397) $ (6,746)
DCO Footnote 1 [Abstract]                      
Interest Allocated to Discontinued Operations 2,000                    
DCO Footnote 2 [Abstract]                      
Loss on sale of business           $ (4,000) $ (2,000) $ 9,000      
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation               4,000      
Discontinued Operation, Intra-Entity Amounts, Discontinued Operation after Disposal, Expense               6,000      
Proceeds from Divestiture of Businesses, Net of Cash Divested               $ 301,000      
Cash Provided by (Used in) Investing Activities, Discontinued Operations (4,000)                    
Cash Provided by (Used in) Financing Activities, Discontinued Operations 15,000                    
Intercompany Sales between Continuing and Discontinued Operations $ (8,000)