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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2019
Derivative Instrument Detail [Abstract] |
Carrying Amounts and Estimated Fair Value of Financial Instruments | Carrying amounts and estimated fair values of our financial instruments as of December 31 are as follows:
|  | 2019 |  |  | 2018 |
(in thousands) |  | Carrying Amount |  |  | Fair Value |  |  | Carrying Amount |  |  | Fair Value |
Cash, cash equivalents and restricted cash (Level 1) |  | $ | 84,254 |  |  | $ | 84,254 |  |  | $ | 79,441 |  |  | $ | 79,441 |
Derivative assets related to interest rate swaps (Level 2) |  | $ | 1,601 |  |  | $ | 1,601 |  |  | $ | 1,510 |  |  | $ | 1,510 |
Derivative liabilities related to interest rate swaps (Level 2) |  | $ | (22,398 | ) |  | $ | (22,398 | ) |  | $ | (2,888 | ) |  | $ | (2,888 | )
Long-term debt, including current portion (Level 2): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term loans |  | $ | (689,820 | ) |  | $ | (703,437 | ) |  | $ | (539,169 | ) |  | $ | (539,037 | )
Senior notes |  |  | — |  |  |  | — |  |  |  | (149,786 | ) |  |  | (154,328 | )
Revenue bonds |  |  | (65,735 | ) |  |  | (68,200 | ) |  |  | (94,735 | ) |  |  | (93,144 | )
Medium-term notes |  |  | (3,000 | ) |  |  | (3,480 | ) |  |  | (3,000 | ) |  |  | (3,419 | )
Total long-term debt1 |  | $ | (758,555 | ) |  | $ | (775,117 | ) |  | $ | (786,690 | ) |  | $ | (789,928 | )
Company owned life insurance (Level 3) |  | $ | 4,157 |  |  | $ | 4,157 |  |  | $ | 3,104 |  |  | $ | 3,104 |
1 | The carrying amount of long-term debt includes principal and unamortized discounts. At December 31, 2018, long-term debt in the above table included the $29.0 million of revenue bonds for the MDF facility which was classified as held for sale. See Note 3: Sale of Deltic MDF Facility for further information.

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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=118260190&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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