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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2021
Derivative Instrument Detail [Abstract] |
Estimated Fair Value of Financial Instruments | The following table presents the estimated fair values of our financial instruments:
|  | June 30, 2021 |  |  | December 31, 2020 |
(in thousands) |  | Carrying Amount |  |  | Fair Value |  |  | Carrying Amount |  |  | Fair Value |
Derivative assets related to interest rate swaps (Level 2) |  | $ | 38,428 |  |  | $ | 38,428 |  |  | $ | 18,529 |  |  | $ | 18,529 |
Derivative liabilities related to interest rate swaps (Level 2) |  | $ | (31,213 | ) |  | $ | (31,213 | ) |  | $ | (46,110 | ) |  | $ | (46,110 | )
Long-term debt, including current portion (Level 2): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term loans |  | $ | (690,794 | ) |  | $ | (710,863 | ) |  | $ | (690,469 | ) |  | $ | (716,631 | )
Revenue bonds |  |  | (65,735 | ) |  |  | (70,034 | ) |  |  | (65,735 | ) |  |  | (67,885 | )
Medium-term notes |  |  | (3,000 | ) |  |  | (3,100 | ) |  |  | (3,000 | ) |  |  | (3,545 | )
Total long-term debt1 |  | $ | (759,529 | ) |  | $ | (783,997 | ) |  | $ | (759,204 | ) |  | $ | (788,061 | )
Company owned life insurance asset (COLI) (Level 3) |  | $ | 3,667 |  |  | $ | 3,667 |  |  | $ | 3,328 |  |  | $ | 3,328 |
1 | The carrying amount of long-term debt includes principal and unamortized discounts.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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