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Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2016
Fair Value Disclosures [Abstract] |
Carrying Value and Fair Value of Long-Term Debt | The following table sets forth the carrying value and fair value of long-term debt as of December 31:
| 2016 |  |  |  | 2015 |
In thousands | Carrying Value |  |  | Fair Value |  |  |  | Carrying Value |  |  | Fair Value |
Variable rate debt | $ | 61,595 |  |  | $ | 61,595 |  |  |  | $ | 58,792 |  |  | $ | 58,792 |
Fixed-rate bonds |  | 250,000 |  |  |  | 256,563 |  |  |  |  | 250,000 |  |  |  | 250,938 |
2.40% Term loan |  | 8,282 |  |  |  | 8,877 |  |  |  |  | 10,109 |  |  |  | 10,535 |
2.05% Term loan |  | 35,163 |  |  |  | 37,089 |  |  |  |  | 42,130 |  |  |  | 42,886 |
1.30% Term Loan |  | 9,788 |  |  |  | 10,062 |  |  |  |  | - |  |  |  | - |
1.55% Term loan |  | 10,333 |  |  |  | 10,082 |  |  |  |  | 2,839 |  |  |  | 2,524 |
Total | $ | 375,161 |  |  | $ | 384,268 |  |  |  | $ | 363,870 |  |  | $ | 365,675 |

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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=73719730&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=73719730&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=6447952&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=6957238&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=73719730&loc=d3e13433-108611 + Details
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