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Fair Value Measurements
12 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
Fair Value of Financial Assets and Liabilities

The Partnership’s financial assets and liabilities consist of cash and cash equivalents, a contract receivable and debt. The carrying amounts reported on the Consolidated Balance Sheets for cash and cash equivalents approximate fair value due to their short-term nature. The Partnership uses available market data and valuation methodologies to estimate the fair value of its debt and contract receivable.
The following table shows the carrying value and estimated fair value of the Partnership's debt and contract receivable:
December 31,
 20212020
(In thousands)Fair Value Hierarchy LevelCarrying
Value
Estimated
Fair Value
Carrying
Value
Estimated
Fair Value
Debt:
NRP 2025 Senior Notes1$296,236 $300,000 $295,160 $274,500 
Opco Senior Notes (1)
3137,309 138,484 176,339 162,760 
Opco Credit Facility3— — — — 
Assets:
Contract receivable, net (current and long-term) (2)
3$33,612 $26,010 $35,313 $27,025 
(1)The fair value of the Opco Senior Notes are estimated by management using quotations obtained for the NRP 2025 Senior Notes on the closing trading prices near period end, which were at 100% and 92% of par value at December 31, 2021 and 2020, respectively.
(2)The fair value of the Partnership's contract receivable is determined based on the present value of future cash flow projections related to the underlying asset at a discount rate of 15% at December 31, 2021 and 2020.

NRP has embedded derivatives in the preferred units related to certain conversion options, redemption features and the change of control provision that are accounted for separately from the preferred units as assets and liabilities at fair value on the Partnership's Consolidated Balance Sheets. Level 3 valuation of the embedded derivatives are based on numerous factors including the likelihood of the event occurring. The embedded derivatives are revalued quarterly and changes in their fair value would be recorded in other expenses, net on the Partnership's Consolidated Statements of Comprehensive Income (Loss). The embedded derivatives had zero value as of December 31, 2021 and 2020.
Fair Value of Non-Financial Assets
The Partnership discloses or recognizes its non-financial assets, such as impairments of coal and aggregates properties at fair value on a nonrecurring basis. Refer to Note 9. Mineral Rights, Net for additional disclosures related to the fair value associated with the impaired assets.