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FAIR VALUE DISCLOSURES (Tables)
12 Months Ended
Dec. 31, 2019
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): 
At December 31,
 20192018
 Aggregate
Principal
Estimated  Fair
Value
Aggregate
Principal
Estimated  Fair
Value
7.15% senior notes
N/A  N/A  $300,000  $307,500  
7.00% senior notes
$300,000  $327,390  $300,000  $309,750  
6.00% senior notes
$400,000  $449,200  $400,000  $379,520  
5.125% senior notes
$300,000  $319,500  $300,000  $255,750