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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 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 EndedSix Months Ended
June 30,June 30,
2021202020212020
Warranty liabilities, beginning of period$83,807 $88,395 $82,744 $91,389 
Reserves provided21,464 17,005 38,808 32,044 
Payments(18,312)(15,914)(33,804)(34,189)
Other adjustments800 (3,208)11 (2,966)
Warranty liabilities, end of period$87,759 $86,278 $87,759 $86,278 
Summary of Changes in Self-Insurance Liability Changes in these liabilities were as follows ($000's omitted):
Three Months EndedSix Months Ended
June 30,June 30,
2021202020212020
Balance, beginning of period$653,068 $719,172 $641,779 $709,798 
Reserves provided22,907 20,177 42,449 38,626 
Adjustments to previously recorded reserves(49,136)(60,662)(55,218)(59,362)
Payments, net (a)
(6,222)(38,673)(8,393)(49,048)
Balance, end of period$620,617 $640,014 $620,617 $640,014 

(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 June 30, 2021 were as follows ($000's omitted):
Years Ending December 31,
2021 (a)
$10,602 
202224,146 
202322,123 
202415,969 
202511,155 
Thereafter25,034 
Total lease payments (b)
109,029 
Less: Interest (c)
10,047 
Present value of lease liabilities (d)
$98,982 

(a)Remaining payments are for the six months ending December 31, 2021.
(b)Lease payments include options to extend lease terms that are reasonably certain of being exercised. There were $2.2 million of legally binding minimum lease payments for leases signed but not yet commenced at June 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 5.5 years and 5.54%, respectively, at June 30, 2021.