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Debt (Tables)
 6 Months Ended
Jun. 30, 2014
Debt Disclosure [Abstract]  
Debt outstanding
Debt outstanding was comprised of the following:
 
 
June 30,
2014
 
December 31,
2013
7.0% senior notes due March 15, 2019
 
$
200,000

 
$
200,000

6.0% senior notes due November 15, 2020(1)
 
189,623

 
183,761

Long-term portion of capital lease obligations
 
1,562

 
1,354

Long-term portion of debt
 
391,185

 
385,115

5.125% senior, unsecured notes due October 1, 2014, net of discount(2)
 
254,024

 
255,026

Capital lease obligations due within one year
 
767

 
563

Total debt
 
$
645,976

 
$
640,704



(1) Includes decrease due to cumulative change in fair value of hedged debt of $10,377 as of June 30, 2014 and $16,239 as of December 31, 2013.
(2) Includes increase due to cumulative change in fair value of hedged debt of $538 as of June 30, 2014 and $1,569 as of December 31, 2013.
Credit facility, amounts available for borrowing
As of June 30, 2014, amounts were available for borrowing under our credit facility as follows:
 
 
Total
available
Credit facility commitment
 
$
350,000

Outstanding letters of credit(1)
 
(9,000
)
Net available for borrowing as of June 30, 2014
 
$
341,000


(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.