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Additional Financial Statement Information (Tables) - Solaris Midstream Holdings, LLC and Subsidiaries | 9 Months Ended
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Sep. 30, 2021
Schedule of Other Balance Sheet information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | September 30, |  | December 31,
​ | ​ | 2021 | ​ | 2020
Other Receivables | ​ | ​ | ​ | ​ | ​ | ​
Insurance and Third Party Receivables for Remediation Expenses | ​ | $ | 3,624 | ​ | $ | 2,543
Capital Call Receivable | ​ | ​ | — | ​ | ​ | 1,160
Other | ​ | ​ | 25 | ​ | ​ | 19
Total Other Receivables | ​ | $ | 3,649 | ​ | $ | 3,722
​ | ​ | ​ | ​ | ​ | ​ | ​
Prepaids, Deposits and Other Current Assets | ​ | ​ | ​ | ​ | ​ | ​
Prepaid Insurance and Other | ​ | $ | 1,007 | ​ | $ | 4,067
Prepaid Groundwater | ​ | ​ | 294 | ​ | ​ | 176
Deposits and Other | ​ | ​ | 48 | ​ | ​ | 72
Total Prepaids, Deposits and Other Current Assets | ​ | $ | 1,349 | ​ | $ | 4,315
​ | ​ | ​ | ​ | ​ | ​ | ​
Accrued and Other Current Liabilities | ​ | ​ | ​ | ​ | ​ | ​
Accrued Operating Expense | ​ | $ | 17,314 | ​ | $ | 14,367
Accrued Capital Costs | ​ | ​ | 9,177 | ​ | ​ | 6,292
Accrued Interest | ​ | ​ | 15,443 | ​ | ​ | 2,661
Other | ​ | ​ | 4,840 | ​ | ​ | 4,518
Total Accrued and Other Current Liabilities | ​ | $ | 46,774 | ​ | $ | 27,838
Schedule of Other Statement of Operations information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended
(in thousands) | ​ | September 30, | ​ | September 30,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
Depreciation, Amortization and Accretion Expense | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Depreciation - Property, Plant and Equipment | ​ | $ | 7,152 | ​ | $ | 6,231 | ​ | $ | 20,888 | ​ | $ | 16,393
Amortization - Intangible Assets | ​ | ​ | 8,151 | ​ | ​ | 5,455 | ​ | ​ | 24,454 | ​ | ​ | 14,957
Accretion of Asset Retirement Obligations | ​ | ​ | 75 | ​ | ​ | 65 | ​ | ​ | 208 | ​ | ​ | 179
Total Depreciation, Amortization and Accretion Expense | ​ | $ | 15,378 | ​ | $ | 11,751 | ​ | $ | 45,550 | ​ | $ | 31,529
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other Operating Expenses | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Loss on Disposal of Asset, Net | ​ | $ | 8 | ​ | $ | 15 | ​ | $ | 225 | ​ | $ | 82
Transaction Costs | ​ | ​ | 253 | ​ | ​ | 172 | ​ | ​ | 330 | ​ | ​ | 3,271
Abandoned Projects (1) | ​ | ​ | 679 | ​ | ​ | 368 | ​ | ​ | 2,035 | ​ | ​ | 1,501
Total Other Operating Expense | ​ | $ | 940 | ​ | $ | 555 | ​ | $ | 2,590 | ​ | $ | 4,854
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest Expense | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest on Debt Instruments | ​ | $ | 8,034 | ​ | $ | 2,686 | ​ | $ | 18,402 | ​ | $ | 7,877
Less: Capitalized Interest | ​ | ​ | (765) | ​ | ​ | (795) | ​ | ​ | (1,981) | ​ | ​ | (3,083)
Interest on Debt Less Capitalized Interest | ​ | ​ | 7,269 | ​ | ​ | 1,891 | ​ | ​ | 16,421 | ​ | ​ | 4,794
Amortization of Financing Costs | ​ | ​ | 611 | ​ | ​ | 208 | ​ | ​ | 1,434 | ​ | ​ | 570
Interest Expense, Net | ​ | $ | 7,880 | ​ | $ | 2,099 | ​ | $ | 17,855 | ​ | $ | 5,364
(1) Abandoned Projects expense is primarily related to expirations of legacy permits and rights-of-way for projects that were not ultimately constructed.
Schedule of Significant Customers | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30, | ​
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 | ​
ConocoPhillips | ​ | 46 | % | 42 | % | 49 | % | 36 | %
Oxy USA | ​ | ** | ​ | 17 | % | 10 | % | 16 | %
XTO Energy Inc. | ​ | ** | ​ | 10 | % | ** | ​ | 11 | %
** Revenues were less than 10%
Schedule of Significant non-cash activity | Significant non-cash activity for the nine months ended September 30, 2021 and 2020 is as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) | ​ | Nine Months Ended September 30,
​ |  | 2021 |  | 2020
Cash Paid for Interest (1) | ​ | $ | 5,636 | ​ | $ | 5,894
Class A Units Issued for Concho Acquisition | ​ | ​ | — | ​ | ​ | 77,602
Redeemable Preferred Units Issued in Concho Acquisition | ​ | ​ | — | ​ | ​ | 71,974
Additions to Asset Retirement Obligations | ​ | ​ | 533 | ​ | ​ | 738
Accrued Additions to Property, Plant and Equipment | ​ | ​ | 13,352 | ​ | ​ | 12,422
​ | ​ | ​ | ​ | ​ | ​ | ​
(1) We paid interest of $15.3 million on October 1, 2021 related to our Senior Sustainability-Linked Notes.

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