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Debt (Tables)
 12 Months Ended
Dec. 31, 2013
Debt Disclosure [Abstract]  
Schedule of Senior Notes
Our senior notes are summarized as follows ($000’s omitted):
 
December 31,
 
2013
 
2012
5.25% unsecured senior notes due January 2014 (a)
$
—

 
$
187,970

5.70% unsecured senior notes due May 2014 (a)
—

 
208,274

5.20% unsecured senior notes due February 2015 (a)
95,633

 
95,615

5.25% unsecured senior notes due June 2015 (a)
233,085

 
264,058

6.50% unsecured senior notes due May 2016 (a)
459,581

 
457,154

7.625% unsecured senior notes due October 2017 (b)
122,663

 
149,481

7.875% unsecured senior notes due June 2032 (a)
299,196

 
299,152

6.375% unsecured senior notes due May 2033 (a)
398,567

 
398,492

6.00% unsecured senior notes due February 2035 (a)
299,443

 
299,417

7.375% unsecured senior notes due June 2046 (a)
150,000

 
150,000

Total senior notes – carrying value (c)
$
2,058,168

 
$
2,509,613

Estimated fair value
$
2,070,744

 
$
2,663,451


(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 as of each year-end ($000’s omitted):
 
 
December 31,
 
2013
 
2012
 
2011
Available credit lines
$
150,000

 
$
150,000

 
$
2,500

Unused credit lines
$
44,336

 
$
11,205

 
$
2,500

Weighted-average interest rate
2.90
%
 
3.00
%
 
4.50
%