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Acquisitions and Divestitures Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Jan. 17, 2020
Dec. 31, 2019
Oct. 01, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2019
Business Acquisition [Line Items]              
Option and purchase right   $ 506   $ 506     $ 0
Gain on sale of business       58,279 $ 0    
Repayments of debt           $ 104,936  
Frontier [Member]              
Business Acquisition [Line Items]              
Percentage of voting interests acquired     60.00%        
Payments to acquire businesses     $ 11,160        
Acquisition costs   326   326      
Remaining percentage to be acquired     40.00%        
Maximum percentage of voting interest to be acquired with predetermined price     10.00%        
Other Current Liabilities | Frontier [Member]              
Business Acquisition [Line Items]              
Option and purchase right   506   506      
Other Noncurrent Liabilities | Frontier [Member]              
Business Acquisition [Line Items]              
Option and purchase right     $ 7,167        
Memcor [Member]              
Business Acquisition [Line Items]              
Acquisition costs   1,000   $ 1,000      
Proceeds from divestiture of businesses   110,000          
Gross proceeds from businesses and interest in affiliates   121,300          
Gain on sale of business   49,000          
Payments to employees   $ 8,300          
Subsequent Event | Memcor [Member]              
Business Acquisition [Line Items]              
Repayments of debt $ 100,000