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Debt (Tables)
 12 Months Ended
Dec. 31, 2014
Debt Disclosure [Abstract]  
Schedule of Senior Notes
Our senior notes are summarized as follows ($000’s omitted):
 
December 31,
 
2014
 
2013
5.20% unsecured senior notes due February 2015 (a)
$
—

 
$
95,633

5.25% unsecured senior notes due June 2015 (a)
236,452

 
233,085

6.50% unsecured senior notes due May 2016 (a)
462,009

 
459,581

7.625% unsecured senior notes due October 2017 (b)
122,752

 
122,663

7.875% unsecured senior notes due June 2032 (a)
299,239

 
299,196

6.375% unsecured senior notes due May 2033 (a)
398,640

 
398,567

6.00% unsecured senior notes due February 2035 (a)
299,469

 
299,443

7.375% unsecured senior notes due June 2046 (a)
—

 
150,000

Total senior notes – carrying value (c)
$
1,818,561

 
$
2,058,168

Estimated fair value
$
1,952,774

 
$
2,070,744


(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,
 
2014
 
2013
 
2012
Available credit lines
$
150,000

 
$
150,000

 
$
150,000

Unused credit lines
$
9,759

 
$
44,336

 
$
11,205

Weighted-average interest rate
2.70
%
 
2.90
%
 
3.00
%