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Debt (Tables)
 12 Months Ended
Dec. 31, 2016
Debt Disclosure [Abstract]  
Schedule of Senior Notes
Our senior notes are summarized as follows ($000’s omitted):
 
December 31,
 
2016
 
2015
6.500% unsecured senior notes due May 2016 (a)
$
—

 
$
465,245

7.625% unsecured senior notes due October 2017 (b)
123,000

 
123,000

4.250% unsecured senior notes due March 2021 (a)
700,000

 
—

5.500% unsecured senior notes due March 2026 (a)
700,000

 
—

5.000% unsecured senior notes due January 2027 (a)
600,000

 
—

7.875% unsecured senior notes due June 2032 (a)
300,000

 
300,000

6.375% unsecured senior notes due May 2033 (a)
400,000

 
400,000

6.000% unsecured senior notes due February 2035 (a)
300,000

 
300,000

Net premiums, discounts, and issuance costs (c)
(12,984
)
 
(12,163
)
Total senior notes
$
3,110,016

 
$
1,576,082

Estimated fair value
$
3,112,297

 
$
1,643,651


(a)
Redeemable prior to maturity; guaranteed on a senior basis by certain wholly-owned subsidiaries.
(b)
Not redeemable prior to maturity; guaranteed on a senior basis by certain wholly-owned subsidiaries.
(c)
The carrying value of senior notes reflects the impact of premiums, discounts, and issuance costs that are amortized to interest cost over the respective terms of the senior notes. As discussed in Note 1, we adopted ASU 2015-03 in January 2016. We applied the new guidance retrospectively to all prior periods presented in the financial statements to conform to the 2016 presentation. As a result, $10.3 million of debt issuance costs at December 31, 2015, were reclassified from other assets to a reduction in senior notes.
Schedule of Financial Services available credit lines
The following is aggregate borrowing information for our mortgage operations ($000’s omitted):
 
 
December 31,
 
 
 
2016
 
2015
Available credit lines
$
360,000

 
$
310,000

Unused credit lines
$
28,379

 
$
42,123

Weighted-average interest rate
2.89
%
 
2.65
%