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Debt (Tables)
 9 Months Ended
Sep. 30, 2020
Debt Disclosure [Abstract]  
Schedule of Debt Long-term debt consisted of the following: 
(in thousands)Sep 30, 2020Dec 31, 2019
4.650% Senior Notes due 2024$500,000 $500,000 
6.000% Senior Notes due 2028300,000 300,000 
Fair value of interest rate swaps on $200 million of principal— 3,235 
Interest rate swap settlements11,525 — 
Unamortized debt issuance costs(5,894)(6,719)
Long-term debt$805,631 $796,516