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Accrued Closure Costs and ARO (Tables)
 12 Months Ended
Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligation

Changes to reported closure liabilities (current and long-term) for the years ended December 31, 2018 and 2017, were as follows:

 

Amounts in thousands      
Balance as of December 31, 2016   $ 7,315  
Accretion expense     460  
Spending     (2,037 )
Adjustment to closure liability     2,657  
Balance as of December 31, 2017     8,395  
Accretion expense     325  
Spending     (5,293 )
Adjustment to closure liability     3,323  
Balance as of December 31, 2018   $ 6,750  
Schedule of Asset Retirement Obligations

The reported closure asset or ARO, is reported as a component of “Net Property and equipment” in the Consolidated Balance Sheets at December 31, 2018 and 2017 with the following activity for the years ended December 31, 2018 and 2017:

 

Amounts in thousands      
Balance as of December 31, 2016   $ 4,148  
Amortization of closure and post-closure asset     (1,071 )
Impairment of closure and post-closure asset     (413 )
Adjustment to closure and post-closure asset     1,257  
Balance as of December 31, 2017     3,921  
Amortization of closure and post-closure asset     (191 )
Balance as of December 31, 2018   $ 3,730