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Inventory
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Inventory
2. INVENTORY

A summary of inventory is as follows (in thousands):
September 30, 2021December 31, 2020
Homes completed or under construction$584,538 $356,706 
Land and lots - developed and under development581,766 482,371 
Land held for sale3,993 5,558 
Total inventory$1,170,297 $844,635 

A summary of interest costs incurred, capitalized and expensed is as follows (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Interest capitalized at beginning of period$18,960 $18,791$17,520 $18,596 
Interest incurred3,597 2,0109,698 7,677 
Interest charged to cost of revenues(2,797)(2,999)(7,458)(8,471)
Interest capitalized at end of period$19,760 $17,802$19,760 $17,802 
Capitalized interest as a percentage of inventory1.7 %2.3 %

As of September 30, 2021, the Company reviewed the performance and outlook for all of its communities for indicators of potential impairment and performed detailed impairment analysis when necessary. As of September 30, 2021, the Company did not identify any selling communities with indicators of impairment. For the three and nine months ended September 30, 2021, the Company did not record an impairment adjustment to reduce the carrying value of impaired communities to fair value.

For the three and nine months ended September 30, 2020, the Company recorded a $0.0 million and a de minimis impairment adjustment, respectively, to reduce the carrying value of impaired communities to fair value.