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Fixed Assets, Mineral Leaseholds, and Asset Retirement Obligations (Tables)
6 Months Ended
Jun. 30, 2020
Fixed Assets And Asset Retirement Obligations [Abstract]  
Schedule of Fixed Assets
Fixed assets, net consisted of the following:
 
June 30,
2020
December 31,
2019
Crude oil pipelines and natural gas pipelines and related assets$2,883,553  $2,891,489  
Alkali facilities, machinery, and equipment600,325  591,547  
Onshore facilities, machinery, and equipment264,208  640,376  
Transportation equipment18,728  19,864  
Marine vessels991,623  979,171  
Land, buildings and improvements217,719  238,451  
Office equipment, furniture and fixtures22,001  22,645  
Construction in progress148,865  115,162  
Other41,891  41,891  
Fixed assets, at cost5,188,913  5,540,596  
Less: Accumulated depreciation(1,238,006) (1,246,121) 
Net fixed assets$3,950,907  $4,294,475  
Schedule of Mineral Leaseholds
Our Mineral Leaseholds, relating to our Alkali Business, consist of the following:
June 30,
2020
December 31,
2019
Mineral leaseholds$566,019  $566,019  
Less: Accumulated depletion(11,998) (10,194) 
Mineral leaseholds, net of accumulated depletion$554,021  $555,825  
Schedule of Depreciation and Depletion Expense
Our depreciation and depletion expense for the periods presented was as follows:
Three Months Ended
June 30,
Six Months Ended
June 30,
2020201920202019
Depreciation expense$75,089  $73,206  $144,331  $144,878  
Depletion expense841  965  1,804  2,284  
Schedule of Change in Asset Retirement Obligation
The following table presents information regarding our AROs since December 31, 2019:
ARO liability balance, December 31, 2019$175,081  
Accretion expense4,510  
Changes in estimate 560  
Settlements(9,851) 
ARO liability balance, June 30, 2020$170,300  
Schedule of Forecast of Accretion Expense of Asset Retirement Obligations With respect to our AROs, the following table presents our estimate of accretion expense for the periods indicated:
Remainder of2020$4,868  
2021$9,497  
2022$9,513  
2023$10,183  
2024$10,900