Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements. (Details)

v3.21.2
Fair Value Measurements. (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Fair Value Disclosures [Abstract]    
Property and equipment held-for-sale at fair value $ 20,535,000 $ 48,548,000