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FAIR VALUE MEASUREMENTS
3 Months Ended
Mar. 31, 2024
Fair Value Disclosures [Abstract]  
FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS
The following tables summarize financial assets and liabilities carried at fair value, all of which were valued from readily available prices or using inputs based upon quoted prices for similar instruments in active markets (known as "Level 1" and "Level 2" inputs, respectively, in the fair value hierarchy established by ASC 820, Fair Value Measurements and Disclosures).

Available-For-Sale Securities
(in thousands)March 31, 2024Level 1Level 2
Corporate notes and bonds$4,308 $4,308 $— 
Mutual funds— — — 
United States Government and agency securities2,200 2,200 — 
Total fair value of available-for-sale securities$6,508 $6,508 $— 

(in thousands)December 31, 2023Level 1Level 2
Corporate notes and bonds$3,144 $3,144 $— 
Mutual funds— 
United States Government and agency securities3,906 3,906 — 
Total fair value of available-for-sale securities$7,053 $7,050 $

Investments in available-for-sale securities are presented in Other assets in the Condensed Consolidated Balance Sheets with contractual maturities ranging from 0-5 years.

Senior Notes

See Note 13 to the Condensed Consolidated Financial Statements for a discussion of the senior notes. The fair value of the senior notes is based on readily available quoted market prices as of March 31, 2024:

(in thousands)March 31, 2024
Senior NotesCarrying ValueEstimated Fair Value
8.125% Senior Notes due 2026 ("BWSN")
$193,035 $126,245 
6.50% Senior Notes due 2026 ("BWNB")
$151,440 $84,443 
Other Financial Instruments

We used the following methods and assumptions in estimating fair value amounts for other financial instruments:

Cash and cash equivalents and restricted cash and cash equivalents. The carrying amounts reported in the accompanying Condensed Consolidated Balance Sheets for cash and cash equivalents and restricted cash and cash equivalents approximate their fair value due to their highly liquid nature.
Revolving Debt. We base the fair value of debt instruments on quoted market prices. Where quoted prices are not available, we base the fair value on Level 2 inputs such as the present value of future cash flows discounted at estimated borrowing rates for similar debt instruments or on estimated prices based on current yields for debt issues of similar quality and terms. The fair value of Revolving Debt approximated its carrying amount at March 31, 2024.