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Change in Accounting Principle (Tables) | 12 Months Ended
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Dec. 31, 2015
Accounting Changes and Error Corrections [Abstract] |
Summary of Adjustments from Change in Accounting Principle | For a summary of the adjustments, see below:
|  | Previous Accounting Method |  | Effect of Change In |  | As Reported
(thousands of dollars) |  | December 31, 2015 |  | Accounting Principle |  | December 31, 2015
Other assets |  | $ | 16,211 |  |  | $ | (3,526 | ) |  | $ | 12,685 |
Long-term debt |  | $ | 493,686 |  |  | $ | (3,526 | ) |  | $ | 490,160 |
|  | As Originally Reported |  | Effect of Change In |  | As Currently Reported
|  | December 31, 2014 |  | Accounting Principle |  | December 31, 2014
Other assets |  | $ | 14,736 |  |  | $ | (4,193 | ) |  | $ | 10,543 |
Long-term debt |  | $ | 492,443 |  |  | $ | (4,193 | ) |  | $ | 488,250 |

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- Definition Tabular disclosure of financial statement line items and the effect of the guidance on the financial statement line items if the entity elects early adoption of accounting guidance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=56949863&loc=d3e22583-107794 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=56949863&loc=d3e22499-107794 + Details
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