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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Estimated Fair Value Of Long-Term Debt
 December 31, 2020December 31, 2019
(in thousands)Carrying
Amount
Fair
Value
Carrying
Amount
Fair
Value
Long-term debt $598,848 $648,671 $642,941 $677,253