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Fair value measurements (Tables)
 6 Months Ended
Jun. 30, 2022
Financial Instruments Disclosure [Abstract]  
Summary of Fair Value of Financial Instruments

Carrying values and fair values of financial instruments that are not carried at fair value are as follows:

 

 

 

June 30,
2022

 

 

December 31,
2021

 

Financial liability

 

Carrying value

 

 

Fair value

 

 

Carrying value

 

 

Fair value

 

Funding obligation

 

$

291,034

 

 

$

167,589

 

 

$

268,976

 

 

$

170,338

 

Operating lease liabilities

 

 

4,281,850

 

 

 

5,733,407

 

 

 

4,370,635

 

 

 

6,149,369

 

Long-term debt

 

 

3,227,362

 

 

 

2,094,902

 

 

 

3,228,449

 

 

 

2,303,648