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Debt (Tables) | 12 Months Ended
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Dec. 31, 2020
Debt Disclosure [Abstract] |
Debt | Debt comprised the following at December 31, 2020 and 2019:
(In thousands) |  | Maturity Dates |  | December 31, 2020 |  |  | December 31, 2019 |
Unsecured private placement notes |  |  |  |  |  |  |  |  |  |
3.95% (net of unamortized debt issuance cost of $273 and $316 for 2020 and 2019, respectively) |  | 2021-2027 |  | $ | 99,727 |  |  | $ | 99,684 |
3.86% (net of unamortized debt issuance cost of $236 and $291 for 2020 and 2019, respectively) |  | 2021-2025 |  |  | 71,193 |  |  |  | 85,423 |
4.86% (net of unamortized debt issuance cost of $108 and $147 for 2020 and 2019, respectively) |  | 2021-2023 |  |  | 27,749 |  |  |  | 36,996 |
Total debt |  |  |  | $ | 198,669 |  |  | $ | 222,103 |
Less current maturities |  |  |  |  | 37,857 |  |  |  | 23,571 |
Long-term debt |  |  |  | $ | 160,812 |  |  | $ | 198,532 |
Schedule of Net Interest Expense | Net interest expense for the years ended December 31, 2020, 2019 and 2018, comprised the following:
(In thousands) |  | 2020 |  |  | 2019 |  |  | 2018 |
Interest expense |  | $ | 9,859 |  |  | $ | 12,744 |  |  | $ | 13,360 |
Interest income |  |  | (2,171 | ) |  |  | (5,717 | ) |  |  | (1,829 | )
|  |  | 7,688 |  |  |  | 7,027 |  |  |  | 11,531 |
Capitalized interest |  |  | (2,279 | ) |  |  | (1,095 | ) |  |  | (760 | )
Interest expense, net |  | $ | 5,409 |  |  | $ | 5,932 |  |  | $ | 10,771 |

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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