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Fair Value Measures and Disclosures (Tables) | 6 Months Ended
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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 Value |  | Fair Value |  | Difference
Senior notes | $ | 450,000 |  |  | $ | 480,375 |  |  | $ | 30,375 |

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- Definition The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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