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Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2013
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:
|  | 2013 |  |  | 2012 |
In thousands |  |  | Carrying Value |  |  |  | Fair Value |  |  |  | Carrying Value |  |  |  | Fair Value |
Fixed-rate bonds |  | $ | 250,000 |  |  | $ | 254,533 |  |  | $ | 250,000 |  |  | $ | 260,340 |
2.05% Term loan |  |  | 58,785 |  |  |  | 57,952 |  |  |  | – |  |  |  | – |
Variable rate debt |  |  | 133,540 |  |  |  | 133,540 |  |  |  | – |  |  |  | – |
Total |  | $ | 442,325 |  |  | $ | 446,025 |  |  | $ | 250,000 |  |  | $ | 260,340 |

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