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Fair Value of Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2017
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:
| June 30, 2017 |  |  |  | December 31, 2016 |
In thousands | Carrying Value |  |  | Fair Value |  |  |  | Carrying Value |  |  | Fair Value |
Variable rate debt | $ | 130,000 |  |  | $ | 130,000 |  |  |  | $ | 61,595 |  |  | $ | 61,595 |
Fixed-rate bonds |  | 250,000 |  |  |  | 256,623 |  |  |  |  | 250,000 |  |  |  | 256,563 |
2.40% Term loan |  | 8,151 |  |  |  | 8,349 |  |  |  |  | 8,282 |  |  |  | 8,877 |
2.05% Term loan |  | 35,023 |  |  |  | 35,570 |  |  |  |  | 35,163 |  |  |  | 37,089 |
1.30% Term Loan |  | 9,781 |  |  |  | 9,712 |  |  |  |  | 9,788 |  |  |  | 10,062 |
1.55% Term loan |  | 11,187 |  |  |  | 11,103 |  |  |  |  | 10,333 |  |  |  | 10,082 |
Total | $ | 444,142 |  |  | $ | 451,357 |  |  |  | $ | 375,161 |  |  | $ | 384,268 |

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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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