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Fair Value of Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2018
Fair Value Disclosures [Abstract] |
Carrying Value and Fair Value of Long-Term Debt | The following table sets forth carrying value and fair value of long-term debt:
| March 31, 2018 |  |  |  | December 31, 2017 |
In thousands | Carrying Value |  |  | Fair Value |  |  |  | Carrying Value |  |  | Fair Value |
Variable rate debt | $ | 196,588 |  |  | $ | 196,588 |  |  |  | $ | 171,200 |  |  | $ | 171,200 |
Fixed-rate bonds |  | 250,000 |  |  |  | 253,980 |  |  |  |  | 250,000 |  |  |  | 253,823 |
2.40% Term loan |  | 7,481 |  |  |  | 7,637 |  |  |  |  | 7,710 |  |  |  | 7,889 |
2.05% Term loan |  | 32,883 |  |  |  | 33,318 |  |  |  |  | 33,607 |  |  |  | 34,122 |
1.30% Term Loan |  | 9,241 |  |  |  | 9,177 |  |  |  |  | 9,423 |  |  |  | 9,370 |
1.55% Term loan |  | 11,324 |  |  |  | 11,229 |  |  |  |  | 11,390 |  |  |  | 11,320 |
Total | $ | 507,517 |  |  | $ | 511,929 |  |  |  | $ | 483,330 |  |  | $ | 487,724 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75026489&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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