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Fair Value Measurements
3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Value Disclosures
4.
Fair Value Measurements:
The accounting guidance establishes a fair value hierarchy that prioritizes valuation inputs into three levels based on the extent to which inputs used in measuring fair value are observable in the market. Each fair value measurement is reported in one of three levels:
Level 1 – inputs are based upon unadjusted quoted prices for identical instruments traded in active markets.
Level 2 – inputs are based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
Level 3 – inputs are generally unobservable and typically reflect management’s estimates of assumptions that market participants would use in pricing the asset or liability. The fair values are therefore determined using model-based techniques that include option pricing models, discounted cash flow models, and similar techniques.
 
The following table presents information about the Company’s financial instruments that are accounted for at fair value on a recurring basis at March 31, 2021 and December 31, 2020 (in thousands):
 
           
Fair Value
 
    
Fair Value
Category
    
March 31, 2021
    
December 31, 2020
 
Assets:
                          
Money market funds
     Level 1      $ 1,324      $ 1,010  
Short-term investments
     Level 2        100,811        104,870  
Mutual funds
     Level 1        16,361        15,841  
The following table presents information about the Company’s financial instruments that are not carried at fair value at March 31, 2021 and December 31, 2020 (in thousands):
 
    
March 31, 2021
    
December 31, 2020
 
    
Carrying
Amount
    
Fair

Value
    
Carrying
Amount
    
Fair

Value
 
Liabilities:
                                   
2023 Notes
     —          —          750,000        756,225  
2027 Notes
     1,000,000        1,066,000        1,000,000        1,070,000  
The Company redeemed the full principal balance of its 5.25% 
senior unsecured notes due 2023 (the “2023 Notes”) in January 2021.
The carrying amounts of cash equivalents, accounts receivable and accounts payable and accrued expenses approximate fair value due to the short maturities of the respective instruments
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