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Accrued Closure Costs and ARO (Tables)
 12 Months Ended
Dec. 31, 2017
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligation

Changes to reported closure liabilities for the years ended December 31, 2017 and 2016, were as follows:

 

Amounts in thousands      
Balance as of December 31, 2015   $ 5,301  
Accretion expense     374  
Payments     (693 )
Adjustment to closure liability     2,333  
Balance as of December 31, 2016     7,315  
Accretion expense     460  
Payments     (2,037 )
Adjustment to closure liability     2,657  
Balance as of December 31, 2017   $ 8,395  
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 Sheet at December 31, 2017 and 2016 with the following activity for the years ended December 31, 2017 and 2016:

 

Amounts in thousands      
Balance as of December 31, 2015   $ 2,575  
Amortization of closure and post-closure asset     (760 )
Adjustment to closure and post-closure asset     2,333  
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