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Long-Term Debt (Tables) | 12 Months Ended
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Dec. 31, 2015
Debt Disclosure [Abstract] |
Summary of Long-Term Debt | Long-term debt consisted of the following:
|  | December 31,
(Thousands of dollars) |  | 2015 |  | 2014
6% senior notes due 2023 (net of unamortized discount of $6,692 at 2015 and $7,557 at 2014) |  | $ | 493,308 |  |  | $ | 492,443 |
Less unamortized debt issuance costs |  | (3,526 | ) |  | (4,193 | )
Total notes payable, net |  | 489,782 |  |  | 488,250 |
Capitalized lease obligations, vehicles, due through 2018 |  | 600 |  |  | — |
Less current maturities |  | (222 | ) |  | — |
Total long-term debt |  | $ | 490,160 |  |  | $ | 488,250 |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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