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Debt (Tables)
 9 Months Ended
Sep. 30, 2013
Debt Disclosure [Abstract]  
Debt outstanding
Debt outstanding was comprised of the following:
 
 
September 30,
2013
 
December 31,
2012
5.125% senior, unsecured notes due October 1, 2014, net of discount(1)
 
$
255,501

 
$
256,770

7.0% senior notes due March 15, 2019
 
200,000

 
200,000

6.0% senior notes due November 15, 2020(2)
 
186,271

 
195,811

Long-term portion of capital lease obligations
 
1,297

 
—

Long-term portion of debt
 
643,069

 
652,581

Capital lease obligations due within one year
 
499

 
—

Total debt
 
$
643,568

 
$
652,581


(1) Includes increase due to cumulative change in fair value of hedged debt of $2,058 as of September 30, 2013 and $3,370 as of December 31, 2012.
(2) Includes decrease due to cumulative change in fair value of hedged debt of $13,729 as of September 30, 2013 and $4,189 as of December 31, 2012.
Credit facility, amounts available for borrowing
As of September 30, 2013, amounts were available for borrowing under our credit facility as follows:
 
 
Total
available
Credit facility commitment
 
$
200,000

Outstanding letters of credit(1)
 
(7,965
)
Net available for borrowing as of September 30, 2013
 
$
192,035


(1) We use standby letters of credit primarily to collateralize certain obligations related to our self-insured workers’ compensation claims. These letters of credit reduce the amount available for borrowing under our credit facility.