Asset Retirement Obligations (Tables)

6 Months Ended

Jun. 30, 2020

Asset Retirement Obligation Disclosure [Abstract]

Summary of Changes in Asset Retirement Obligations

The following table summarizes the changes in asset retirement obligations for the six months ended June 30, 2020:

Total asset retirement obligations at December 31, 2019	$	224,704
Accretion for the period	14,679
Sites added during the period	621
Revisions in estimated cash flows (1)	13,244
Expenditures for the period	(11,047)
Total asset retirement obligations at June 30, 2020	242,201
Less current portion (2)	(35,200)
Long-term portion	$	207,001

⁽¹⁾ The revisions in estimated cash flows resulted from changes in mine plans primarily associated with the strategic actions impacting certain mines during the three months ended June 30, 2020 of which approximately $3,100 was recorded to depreciation, depletion and amortization. Refer to Note 8.

(2) Included within accrued expenses and other current liabilities on the Company’s Condensed Consolidated Balance Sheets.