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Fair Value of Financial Instruments and Fair Value Measurements
6 Months Ended
Jun. 30, 2020
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments and Fair Value Measurements Fair Value of Financial Instruments and Fair Value Measurements
The estimated fair values of financial instruments are determined based on relevant market information. These estimates involve uncertainty and cannot be determined with precision.
The carrying amounts for cash and cash equivalents, trade accounts receivable, net, prepaid expenses and other current assets, short-term and long-term restricted cash, short-term and long-term deposits, trade accounts payable, and accrued expenses and other current liabilities approximate fair value as of June 30, 2020 and December 31, 2019 due to the short maturity of these instruments.
The following tables set forth by level, within the fair value hierarchy, the Company’s long-term debt at fair value as of June 30, 2020 and December 31, 2019:
June 30, 2020
Carrying
     Amount (1)
Total Fair ValueQuoted Prices in Active Markets
(Level 1)
Significant Other Observable Inputs
(Level 2)
Significant Unobservable Inputs
(Level 3)
Term Loan Credit Facility - due June 2024$539,594  $366,524  $366,524  $—  $—  
ABL Facility - due April 202230,750  27,717  —  —  27,717  
LCC Note Payable40,214  34,021  —  —  34,021  
LCC Water Treatment Obligation7,073  5,281  —  —  5,281  
Total long-term debt$617,631  $433,543  $366,524  $—  $67,019  

December 31, 2019
Carrying
     Amount (1)
Total Fair ValueQuoted Prices in Active Markets
(Level 1)
Significant Other Observable Inputs
(Level 2)
Significant Unobservable Inputs
(Level 3)
Term Loan Credit Facility - due June 2024$538,765  $461,402  $461,402  $—  $—  
LCC Note Payable37,695  33,884  —  —  33,884  
LCC Water Treatment Obligation7,211  6,280  —  —  6,280  
Total long-term debt$583,671  $501,566  $461,402  $—  $40,164  
(1) Net of debt discounts and debt issuance costs.

The following tables set forth by level, within the fair value hierarchy, the Company’s acquisition-related obligations at fair value as of June 30, 2020 and December 31, 2019:
 June 30, 2020
Carrying
     Amount (1)
Total Fair ValueQuoted Prices in Active Markets
(Level 1)
Significant Other Observable Inputs
(Level 2)
Significant Unobservable Inputs
(Level 3)
UMWA Funds Settlement Liability$3,367  $2,867  $—  $—  $2,867  
Reclamation Funding Liability11,852  11,708  —  —  11,708  
Environmental Settlement Obligations12,416  10,101  —  —  10,101  
Total acquisition-related obligations$27,635  $24,676  $—  $—  $24,676  
 December 31, 2019
Carrying
     Amount (1)
Total Fair ValueQuoted Prices in Active Markets
(Level 1)
Significant Other Observable Inputs
(Level 2)
Significant Unobservable Inputs
(Level 3)
UMWA Funds Settlement Liability$3,069  $2,929  $—  $—  $2,929  
Reclamation Funding Liability10,808  10,658  —  —  10,658  
Environmental Settlement Obligations13,594  12,197  —  —  12,197  
Total acquisition-related obligations$27,471  $25,784  $—  $—  $25,784  
(1) Net of discounts.

The following table sets forth by level, within the fair value hierarchy, the Company’s financial and non-financial assets and liabilities that were accounted for at fair value on a recurring basis as of June 30, 2020 and December 31, 2019. Financial and non-financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement requires judgment, and may affect the determination of fair value for assets and liabilities and their placement within the fair value hierarchy levels.
 June 30, 2020
Total Fair ValueQuoted Prices in Active Markets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
Contingent Revenue Obligation$20,668  $—  $—  $20,668  
Trading securities$27,413  $20,973  $6,440  $—  

 December 31, 2019
Total Fair ValueQuoted Prices in Active Markets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
Contingent Revenue Obligation$52,427  $—  $—  $52,427  
Trading securities$13,508  $5,506  $8,002  $—  

The following tables are a reconciliation of the financial and non-financial assets and liabilities that were accounted for at fair value on a recurring basis and that were categorized within Level 3 of the fair value hierarchy:
December 31, 2019Payments
Loss (Gain) Recognized in Earnings (1)
Transfer In (Out) of Level 3 Fair Value HierarchyJune 30, 2020
Contingent Revenue Obligation $52,427  $(14,710) $(17,049) $—  $20,668  
(1) The gain recognized in earnings resulted primarily from a change in the forecasted future revenue associated with this obligation and an increase in annual volatility as of June 30, 2020.

December 31, 2018
PaymentsMeasurement Period AdjustmentsLoss (Gain) Recognized in EarningsTransfer In (Out) of Level 3 Fair Value HierarchyJune 30, 2019
Contingent Revenue Obligation $59,880  $(9,627) 5,738  $2,950  $—  $58,941  

The following methods and assumptions were used to estimate the fair values of the assets and liabilities in the tables above:
Level 1 Fair Value Measurements
Term Loan Credit Facility - due June 2024 - The fair value is based on observable market data.
Trading Securities - Includes money market funds and other cash equivalents. The fair value is based on observable market data.

Level 2 Fair Value Measurements
Trading Securities - Includes certificates of deposit, mutual funds, corporate debt securities and U.S. treasury and agency securities. The fair values of the Company’s trading securities are obtained from a third-party pricing service provider. The fair values provided by the pricing service provider are based on observable market inputs including credit spreads and broker-dealer quotes, among other inputs. The Company classifies the prices obtained from the pricing services within Level 2 of the fair value hierarchy because the underlying inputs are directly observable from active markets. However, the pricing models used entail a certain amount of subjectivity and therefore differing judgments in how the underlying inputs are modeled could result in different estimates of fair value.

Level 3 Fair Value Measurements

ABL Facility - due April 2022 - Observable transactions are not available to aid in determining the fair value of this item. Therefore, the fair value was derived by using the expected present value approach in which estimated cash flows are discounted using a risk-free interest rate adjusted for credit risk (discount rate of approximately 10%) as of June 30, 2020.

LCC Note Payable, LCC Water Treatment Obligation, UMWA Funds Settlement Liability, Environmental Settlement Obligations and Reclamation Funding Liability - Observable transactions are not available to aid in determining the fair value of these items. Therefore, the fair value was derived by using the expected present value approach in which estimated cash flows are discounted using a risk-free interest rate adjusted for credit risk (discount rates of approximately 35% and 21% as of June 30, 2020 and December 31, 2019, respectively).

Contingent Revenue Obligation - The fair value of the contingent revenue obligation was estimated using a Black-Scholes pricing model and is marked to market at each reporting period with changes in value reflected in earnings. The inputs included in the Black-Scholes pricing model are the Company's forecasted future revenue, the stated royalty rate, the remaining periods in the obligation; annual risk-free interest rate based on the U.S. Constant Maturity Treasury Curve and annualized volatility. The annualized volatility was calculated by observing volatilities for comparable companies with adjustments for the Company's size and leverage. The range of significant unobservable inputs used to value the contingent revenue obligation as of June 30, 2020 and December 31, 2019, are set forth in the following table:
 June 30, 2020December 31, 2019
Forecasted future revenue
$0.83 - $0.84 billion
$1.1 - $1.2 billion
Stated royalty rate
1.0% - 1.5%
1.0% - 1.5%
Annualized volatility
13.9% - 30.4% (25.0%)
9.4% - 28.1% (19.9%)