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Fair Value Measurements
 6 Months Ended
Jun. 30, 2024
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
The following tables present our assets and liabilities measured at fair value on a recurring basis as of June 30, 2024 and December 31, 2023 classified by the input method used to measure fair value:
(in thousands)Level 1Level 2Level 3
June 30, 2024
Assets:
Investments:
Money Market Funds$2,606 $— $— 
Mutual Funds10,121 — — 
Corporate Debt Securities— 1,615 — 
Government Debt Securities
— 59,218 — 
Total Assets$12,727 $60,833 $— 
Liabilities:
Derivative Instruments$— $1,979 $— 
Total Liabilities$— $1,979 $— 
December 31, 2023
Assets:
Investments:
Money Market Funds$3,125 $— $— 
Mutual Funds7,771 — — 
Corporate Debt Securities— 1,579 — 
Government Debt Securities
— 7,724 — 
Total Assets$10,896 $9,303 $— 
Liabilities:
Derivative Instruments$— $4,210 $— 
Total Liabilities$— $4,210 $— 
Level 1 fair value measurements are based on quoted prices (unadjusted) in active markets for identical assets or liabilities that we have the ability to access at the measurement date.
The level 2 fair value measurements for government and corporate debt securities are determined based on 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 June 30, 2024 and December 31, 2023:
 June 30, 2024December 31, 2023
(in thousands)Carrying
Amount		Fair ValueCarrying
Amount		Fair Value
Assets:
Cash and Cash Equivalents$230,672 $230,672 $230,373 $230,373 
Total230,672 230,672 230,373 230,373 
Liabilities:
Short-Term Debt12,809 12,809 81,422 81,422 
Long-Term Debt943,592 809,954 824,059 710,839 
Total$956,401 $822,763 $905,481 $792,261 
The following methods and assumptions were used to estimate the fair value of each class of financial instruments for which it is practicable to estimate that value:
Cash Equivalents: The carrying amount approximates fair value because of the short-term maturity of those instruments.
Short-Term Debt: The carrying amount approximates fair value because the debt obligations are short-term and the 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.