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Fair Value of Financial Instruments
9 Months Ended
Sep. 30, 2020
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments Fair Value of Financial Instruments
For cash and cash equivalents, accounts receivable, accounts payable and short-term debt, the carrying amount is assumed to approximate fair value due to the short-term nature of these items.
Investments held in a Rabbi Trust for the supplemental executive retirement plan ("SERP") are measured at fair value and totaled $22.8 million as of September 30, 2020. All equity investments in the Rabbi Trust are Level 1 investments in mutual funds. The investments held in the Rabbi Trust are included in "Other Property and Investments" on Registrant's balance sheets.
The table below estimates the fair value of long-term debt held by GSWC. The fair values as of September 30, 2020 and December 31, 2019 were determined using rates for similar financial instruments of the same duration utilizing Level 2 methods and assumptions. Changes in the assumptions will produce different results.
September 30, 2020December 31, 2019
(dollars in thousands)Carrying AmountFair ValueCarrying AmountFair Value
Financial liabilities:    
Long-term debt—GSWC (1)
$444,349 $546,363 $284,699 $376,467 
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(1) Excludes debt issuance costs and redemption premiums.