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Discontinued Operations Net assets of discontinued operations (Details) - USD ($)
$ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 01, 2017
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Loss on sale of business       $ (8,580)  
Proceeds from disposals of business/investment       301,297 $ 316,000
Cash disposed as part of divestment         $ 15,000
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation       (4,000)  
Intercompany payable between discontinued operations and continuing operations $ 6,000     6,000  
Interest Allocated to Discontinued Operations   $ 2,000      
Cash Provided by (Used in) Operating Activities, Discontinued Operations       (4,000)  
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      
Purchases under supply agreement $ 4,000   $ 10,000    
Payments to Acquire Productive Assets     (62,189) (44,398)  
Discontinued Operations          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Payments to Acquire Productive Assets     $ 0 $ (3,598)