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Debt (Tables)
 6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Schedule of Debt
Long-term debt consisted of the following: 
 
(in thousands)
 
Jun 30, 2020
 
Dec 31, 2019
4.650% Senior Notes due 2024
 
$
500,000

 
$
500,000

6.000% Senior Notes due 2028
 
300,000

 
300,000

Fair value of interest rate swaps on $200 million of principal
 
—

 
3,235

Interest rate swap settlements
 
12,175

 
—

Unamortized debt issuance costs
 
(6,169
)
 
(6,719
)
Long-term debt
 
$
806,006

 
$
796,516