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FAIR VALUE DISCLOSURES (Tables)
9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Schedule of Fair Value of Fixed-Rate Debt The fair value of our fixed-rate debt is derived from quoted market prices by independent dealers (Level 2 inputs as per the discussion above) and is as follows (in thousands):
As of
 September 30, 2021December 31, 2020
 Aggregate
Principal
Estimated  Fair
Value
Aggregate
Principal
Estimated  Fair
Value
7.00% senior notes due 2022
$— $— $300,000 $319,758 
6.00% senior notes due 2025
$400,000 $451,000 $400,000 $451,913 
5.125% senior notes due 2027
$300,000 $333,000 $300,000 $333,328 
3.875% senior notes due 2029
$450,000 $471,375 $— $—