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Debt (Tables)
 12 Months Ended
Dec. 31, 2015
Debt Disclosure [Abstract]  
Schedule of Debt
Long-term Debt consisted of the following: 
 
 
 
December 31,
 
(in thousands)
 
2015
 
2014
4.650% Senior Notes due 2024:
 
 
 
 
 
Principal of the notes
 
$
500,000

 
$
500,000

 
Issuance costs, net of amortization
 
(6,073
)
 
(6,761
)
 
Fair value of interest rate swap on $100 million of principal
 
1,909

 
230

Term Loan Facility
 
300,000

 
250,000

Revolving Credit Facility
 
—

 
—

Long-term Debt
 
$
795,836

 
$
743,469