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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2018
Fair Value Disclosures [Abstract] |
Financial assets and liabilities measured at fair value on a recurring basis | The following fair value hierarchy table presents information about the Company's financial assets and liabilities measured at fair value on a recurring basis:
(In thousands) | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Balance at December 31, 2018
Assets |  |  |  |  |  |  |  |  |  |  |
Deferred compensation plan | $ | 14,699 |  |  | $ | — |  |  | $ | — |  |  | $ | 14,699 |
Derivative instruments | — |  |  | 35,689 |  |  | 24,416 |  |  | 60,105 |
Total assets | $ | 14,699 |  |  | $ | 35,689 |  |  | $ | 24,416 |  |  | $ | 74,804 |
Liabilities |  |  |  |  |  |  |  |  |  |  |
Deferred compensation plan | $ | 25,780 |  |  | $ | — |  |  | $ | — |  |  | $ | 25,780 |
Derivative instruments | — |  |  | — |  |  | 2,440 |  |  | 2,440 |
Total liabilities | $ | 25,780 |  |  | $ | — |  |  | $ | 2,440 |  |  | $ | 28,220 |
(In thousands) | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Balance at December 31, 2017
Assets |  |  |  |  |  |  |  |  |  |  |
Deferred compensation plan | $ | 14,966 |  |  | $ | — |  |  | $ | — |  |  | $ | 14,966 |
Derivative instruments | — |  |  | — |  |  | 2,239 |  |  | 2,239 |
Total assets | $ | 14,966 |  |  | $ | — |  |  | $ | 2,239 |  |  | $ | 17,205 |
Liabilities |  |  |  |  |  |  |  |  |  |  |
Deferred compensation plan | $ | 29,145 |  |  | $ | — |  |  | $ | — |  |  | $ | 29,145 |
Derivative instruments | — |  |  | — |  |  | 30,637 |  |  | 30,637 |
Total liabilities | $ | 29,145 |  |  | $ | — |  |  | $ | 30,637 |  |  | $ | 59,782 |
Fair Value of Financial Assets and Liabilities Classified as Level 3 | The following table sets forth a reconciliation of changes in the fair value of financial assets and liabilities classified as Level 3 in the fair value hierarchy:
| Year Ended December 31,
(In thousands) | 2018 |  | 2017 |  | 2016
Balance at beginning of period | $ | (28,398 | ) |  | $ | (15,868 | ) |  | $ | — |
Total gain (loss) included in earnings | 31,184 |  |  | (1,866 | ) |  | (17,886 | )
Settlement (gain) loss | 19,190 |  |  | (10,664 | ) |  | 2,018 |
Transfers in and/or out of Level 3 | — |  |  | — |  |  | — |
Balance at end of period | $ | 21,976 |  |  | $ | (28,398 | ) |  | $ | (15,868 | )
Change in unrealized gains (losses) relating to assets and liabilities still held at the end of the period | $ | 19,732 |  |  | $ | (28,398 | ) |  | $ | (15,868 | )
Carrying amounts and fair values of long-term debt | The carrying amount and fair value of debt is as follows:
| December 31, 2018 |  | December 31, 2017
(In thousands) | Carrying Amount |  | Estimated Fair Value |  | Carrying Amount |  | Estimated Fair Value
Long-term debt | $ | 1,226,104 |  |  | $ | 1,202,994 |  |  | $ | 1,521,891 |  |  | $ | 1,527,624 |
Current maturities | — |  |  | — |  |  | (304,000 | ) |  | (312,055 | )
Long-term debt, excluding current maturities | $ | 1,226,104 |  |  | $ | 1,202,994 |  |  | $ | 1,217,891 |  |  | $ | 1,215,569 |

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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=109250915&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=99377789&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) using recurring unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258 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 (c) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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