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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]  
Summary of Changes in Warranty Liability Changes to warranty liabilities were as follows ($000’s omitted):
Three Months Ended
March 31,
20212020
Warranty liabilities, beginning of period$82,744 $91,389 
Reserves provided17,344 15,039 
Payments(15,493)(18,276)
Other adjustments(788)243 
Warranty liabilities, end of period$83,807 $88,395 
Summary of Changes in Self-Insurance Liability Changes in these liabilities were as follows ($000's omitted):
Three Months Ended
March 31,
20212020
Balance, beginning of period$641,779 $709,798 
Reserves provided19,542 18,449 
Adjustments to previously recorded reserves(6,082)1,300 
Payments, net (a)
(2,171)(10,375)
Balance, end of period$653,068 $719,172 

(a)    Includes net changes in amounts expected to be recovered from our insurance carriers, which are recorded in other assets (see below).
Schedule of Future Minimum Lease Payments Required Under Leases
The future minimum lease payments required under our leases as of March 31, 2021 were as follows ($000's omitted):
Years Ending December 31,
2021 (a)
$15,969 
202222,646 
202320,567 
202414,374 
20259,521 
Thereafter19,578 
Total lease payments (b)
102,655 
Less: Interest (c)
14,324 
Present value of lease liabilities (d)
$88,331 

(a)Remaining payments are for the nine months ending December 31, 2021.
(b)Lease payments include options to extend lease terms that are reasonably certain of being exercised. There were $1.7 million of legally binding minimum lease payments for leases signed but not yet commenced at March 31, 2021.
(c)Our leases do not provide a readily determinable implicit rate. Therefore, we must estimate our discount rate for such leases to determine the present value of lease payments at the lease commencement date.
(d)The weighted average remaining lease term and weighted average discount rate used in calculating our lease liabilities were 5.4 years and 5.6%, respectively, at March 31, 2021.