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Fair Value Measurements
12 Months Ended
Dec. 31, 2023
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
The following tables present our assets measured at fair value on a recurring basis as of December 31, 2023 and 2022 classified by the input method used to measure fair value:
Level 1Level 2Level 3
December 31, 2023
Assets
Investments:
Money Market Funds$3,125 $ $ 
Mutual Funds7,771   
Corporate Debt Securities 1,579  
Government Debt Securities
 7,724  
Total Assets10,896 9,303  
Liabilities
Derivative Instruments 4,210  
Total Liabilities$ $4,210 $ 
December 31, 2022
Assets
Investments:
Money Market Funds$1,560 $— $— 
Mutual Funds5,503 — — 
Corporate Debt Securities— 1,434 — 
Government Debt Securities
— 7,327 — 
Total Assets$7,063 $8,761 $— 
Liabilities
Derivative Instruments— 7,130 — 
Total Liabilities
$— $7,130 $— 
The level 2 fair value measurements for government and corporate debt securities are determined on the basis of valuations provided by a third-party pricing service which utilizes industry accepted valuation models and observable market inputs to determine valuation. Some valuations or model inputs used by the pricing service may be based on broker quotes.
The level 2 fair value measurements for derivative instruments are determined by using inputs such as forward electric commodity prices, adjusted for location differences. These inputs are observable in the marketplace throughout the full term of the instrument, can be derived from observable data, or are supported by observable levels at which transactions are executed in the marketplace.
In addition to assets recorded at fair value on a recurring basis, we also hold financial instruments that are not recorded at fair value in the consolidated balance sheets but for which disclosure of the fair value of these financial instruments is provided. The following reflects the carrying value and estimated fair value of these assets and liabilities as of December 31, 2023 and 2022:
 December 31, 2023December 31, 2022
(in thousands)Carrying
Amount
Fair ValueCarrying
Amount
Fair Value
Assets:
Cash and Cash Equivalents$230,373 $230,373 $118,996 $118,996 
Total230,373 230,373 118,996 118,996 
Liabilities:
Short-Term Debt81,422 81,422 8,204 8,204 
Long-Term Debt824,059 710,839 823,821 681,615 
Total$905,481 $792,261 $832,025 $689,819 
The following methods and assumptions were used to estimate the fair value of each class of financial instruments:
Cash Equivalents: The carrying amount approximates fair value because of the short-term maturity of these instruments.
Short-Term Debt: The carrying amount approximates fair value because the debt obligations are short-term in nature and balances outstanding are subject to variable rates of interest which reset frequently, a Level 2 fair value input.
Long-Term Debt: The fair value of long-term debt is estimated based on current market indications for borrowings of similar maturities with similar terms, a Level 2 fair value input.