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FAIR VALUE MEASUREMENTS (Tables)
 6 Months Ended
Jun. 30, 2022
Fair Value Disclosures [Abstract]  
Schedule of Fair Value of Financial Assets and Liabilities
The following tables summarize our 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 the FASB Topic, Fair Value Measurements and Disclosures).
(in thousands)
Available-for-sale securitiesJune 30, 2022Level 1Level 2
Corporate notes and bonds$6,900 $6,900 $— 
Mutual funds640 — 640 
United States Government and agency securities3,016 3,016 — 
Total fair value of available-for-sale securities$10,556 $9,916 $640 

(in thousands)
Available-for-sale securitiesDecember 31, 2021Level 1Level 2
Corporate notes and bonds$9,477 $9,477 $— 
Mutual funds714 — 714 
United States Government and agency securities2,017 2,017 — 
Total fair value of available-for-sale securities$12,208 $11,494 $714 
The fair value of the senior notes is based on readily available quoted market prices as of June 30, 2022.
(in thousands)June 30, 2022
Senior NotesCarrying ValueEstimated Fair Value
8.125% Senior Notes due 2026 ('BWSN')
$188,595 $179,216 
6.50% Senior Notes due 2026 ('BWNB')
$151,440 $131,026