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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]  
Summary of Changes in Loan Origination Liability
Changes in these liabilities were as follows ($000's omitted):
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2017
 
2016
 
2017
 
2016
Liabilities, beginning of period
$
35,116

 
$
47,093

 
$
35,114

 
$
46,381

Reserves provided (released), net
(7
)
 
(99
)
 
(5
)
 
767

Payments
(175
)
 
(11,049
)
 
(175
)
 
(11,203
)
Liabilities, end of period
$
34,934

 
$
35,945

 
$
34,934

 
$
35,945
Summary of Changes in Warranty Liability
Changes to warranty liabilities were as follows ($000’s omitted):
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2017
 
2016
 
2017
 
2016
Warranty liabilities, beginning of period
$
64,681

 
$
60,936

 
$
66,134

 
$
61,179

Reserves provided
12,446

 
14,204

 
23,088

 
26,523

Payments
(16,815
)
 
(13,101
)
 
(28,914
)
 
(25,663
)
Other adjustments (a)
13,041

 
(200
)
 
13,045

 
(200
)
Warranty liabilities, end of period
$
73,353

 
$
61,839

 
$
73,353

 
$
61,839
Summary of Changes in Self-Insurance Liability
Changes in these liabilities were as follows ($000's omitted):
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2017
 
2016
 
2017
 
2016
Balance, beginning of period
$
835,326

 
$
922,385

 
$
831,058

 
$
924,563

Reserves provided, net
18,894

 
25,317

 
38,609

 
45,516

Adjustments to previously recorded reserves (a)
(19,813
)
 
—

 
(21,793
)
 
(448
)
Payments, net (b)
(19,651
)
 
(10,991
)
 
(33,118
)
 
(32,920
)
Balance, end of period
$
814,756

 
$
936,711

 
$
814,756

 
$
936,711