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Debt (Tables)
 12 Months Ended
Dec. 31, 2015
Debt Disclosure [Abstract]  
Schedule of Senior Notes
Our senior notes are summarized as follows ($000’s omitted):
 
December 31,
 
2015
 
2014
5.25% unsecured senior notes due June 2015 (a)
$
—

 
$
236,452

6.50% unsecured senior notes due May 2016 (a)
464,436

 
462,009

7.625% unsecured senior notes due October 2017 (b)
122,841

 
122,752

7.875% unsecured senior notes due June 2032 (a)
299,283

 
299,239

6.375% unsecured senior notes due May 2033 (a)
398,714

 
398,640

6.00% unsecured senior notes due February 2035 (a)
299,495

 
299,469

Total senior notes – carrying value (c)
$
1,584,769

 
$
1,818,561

Estimated fair value
$
1,643,651

 
$
1,952,774


(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 recorded carrying value reflects the impact of various discounts and premiums that are amortized to interest cost over the respective terms of the senior notes.
Schedule of Financial Services available credit lines
The following is aggregate borrowing information for our mortgage operations ($000’s omitted):
 
 
December 31,
 
 
 
2015
 
2014
Available credit lines
$
310,000

 
$
150,000

Unused credit lines
$
42,123

 
$
9,759

Weighted-average interest rate
2.65
%
 
2.70
%