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Long-term Debt
3 Months Ended
Mar. 31, 2016
Long-term Debt and Capital Lease Obligations [Abstract]  
Long-term Debt
Long-term Debt
(in thousands)
 
March 31,
2016
 
December 31,
2015
Senior notes - 4.10% due 2022 (net of related deferred financing costs)
 
$
346,066

 
$
345,920

Revolving credit facility
 
190,000

 
145,000

Capital lease obligation
 
5,058

 
0

 
 
$
541,124

 
$
490,920



The outstanding senior notes have an aggregate principal amount of $350 million and are registered under the Securities Act of 1933.
The capital lease obligation in the table above is related to the Singapore manufacturing facility. We record our capital lease obligation at the lower of fair market value of the related asset at the inception of the lease or the present value of the total minimum lease payments.
The following table provides information related to the unused portion of our revolving credit facility:  
(in thousands)
 
March 31,
2016
 
December 31,
2015
Maximum borrowing capacity under the revolving credit facility
 
$
650,000

 
$
650,000

Outstanding borrowings under the revolving credit facility
 
190,000

 
145,000

Outstanding letters of credit
 
3,685

 
2,895

Unused portion of revolving credit facility
 
$
456,315

 
$
502,105



The average interest rate for borrowings under our revolving credit facility was 2.0% during the first three months of 2016 and 1.9% during the full year of 2015.
We were in compliance with all covenants under our debt agreements at March 31, 2016 and at December 31, 2015.