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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]  
Summary of Changes in Warranty Liability Changes to warranty liabilities were as follows ($000’s omitted):
Three Months EndedNine Months Ended
September 30,September 30,
2021202020212020
Warranty liabilities, beginning of period$87,759 $86,278 $82,744 $91,389 
Reserves provided22,993 15,320 61,801 47,364 
Payments(19,346)(18,551)(53,150)(52,741)
Other adjustments317 501 328 (2,464)
Warranty liabilities, end of period$91,723 $83,548 $91,723 $83,548 
Summary of Changes in Self-Insurance Liability Changes in these liabilities were as follows ($000's omitted):
Three Months EndedNine Months Ended
September 30,September 30,
2021202020212020
Balance, beginning of period$620,617 $640,014 $641,779 $709,798 
Reserves provided21,569 21,992 64,018 60,618 
Adjustments to previously recorded reserves(1,349)— (56,567)(59,362)
Payments, net (a)
(16,175)(9,460)(24,568)(58,508)
Balance, end of period$624,662 $652,546 $624,662 $652,546 

(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 September 30, 2021 were as follows ($000's omitted):
Years Ending December 31,
2021 (a)
$5,571 
202224,395 
202322,433 
202416,270 
202511,463 
Thereafter26,092 
Total lease payments (b)
106,224 
Less: Interest (c)
9,292 
Present value of lease liabilities (d)
$96,932 

(a)Remaining payments are for the three months ended December 31, 2021.
(b)Lease payments include options to extend lease terms that are reasonably certain of being exercised. There were $3.0 million of legally binding minimum lease payments for leases signed but not yet commenced at September 30, 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 5.53%, respectively, at September 30, 2021.