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Fair Value Measures and Disclosures (Tables)
6 Months Ended
Jun. 30, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements Nonrecurring [Text Block] The fair value of our Notes is based on Level 1 inputs and was as follows at June 30, 2021:
June 30, 2021
(in thousands)Carrying ValueFair ValueDifference
Senior notes$450,000 $480,375 $30,375