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Long-term Debt
3 Months Ended
Mar. 31, 2015
Long-term Debt and Capital Lease Obligations [Abstract]  
Long-term Debt
Long-term Debt
(in thousands)
 
March 31,
2015
 
December 31,
2014
Senior notes - 4.10% due 2022
 
$
349,541

 
$
349,526

Revolving credit facility
 
24,000

 
14,000

 
 
$
373,541

 
$
363,526



The outstanding senior notes have an aggregate principal amount of $350 million and are registered under the Securities Act of 1933.
The following table provides information related to the unused portion of our revolving credit facility:  
(in thousands)
 
March 31,
2015
 
December 31,
2014
Maximum borrowing capacity under the revolving credit facility
 
$
650,000

 
$
650,000

Outstanding borrowings under the revolving credit facility
 
24,000

 
14,000

Outstanding letters of credit
 
2,706

 
3,271

Unused portion of revolving credit facility
 
$
623,294

 
$
632,729



The average interest rate for borrowings under our revolving credit facility was 2.4% during the first three months of 2015 and 2.9% during 2014.
We were in compliance with all covenants under our debt agreements at March 31, 2015 and at December 31, 2014.