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M&EC (Tables)
6 Months Ended
Jun. 30, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligation

The following reflects changes to the closure liabilities for the M&EC facility from year end 2018:

 

Amounts in thousands    
Balance as of December 31, 2018  $1,142 
Adjustment to closure liability   330 
Spending   (1,316)
Balance as of June 30, 2019  $156