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Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2015
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:
|  | 2015 |  |  | 2014 |
In thousands |  |  | Carrying Value |  |  |  | Fair Value |  |  |  | Carrying Value |  |  |  | Fair Value |
Variable rate debt |  | $ | 58,792 |  |  | $ | 58,792 |  |  | $ | 90,555 |  |  | $ | 90,555 |
Fixed-rate bonds |  |  | 250,000 |  |  |  | 250,938 |  |  |  | 250,000 |  |  |  | 255,470 |
2.40% Term loan |  |  | 10,109 |  |  |  | 10,535 |  |  |  | 12,155 |  |  |  | 12,626 |
2.05% Term loan |  |  | 42,130 |  |  |  | 42,886 |  |  |  | 51,902 |  |  |  | 53,106 |
1.55% Term loan |  |  | 2,839 |  |  |  | 2,524 |  |  |  | – |  |  |  | – |
Total |  | $ | 363,870 |  |  | $ | 365,675 |  |  | $ | 404,612 |  |  | $ | 411,757 |

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