v3.5.0.2

Investments | 6 Months Ended
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Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract] |
Investments | 2. INVESTMENTS We classify all of our short-term investments as available-for-sale. We carry these at fair value and report unrealized gains and losses, net of taxes, in Accumulated other comprehensive gain (loss), which is a separate component of shareholders’ equity in our Condensed Consolidated Balance Sheets. These unrealized gains and losses are also reflected in our Condensed Consolidated Statements of Comprehensive Income and Condensed Consolidated Statements of Shareholders’ Equity. We determine cost, gains, and losses using the specific identification method. Investments consisted of the following as of June 30, 2016:
|  |  |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost Basis |  |  | Gains |  |  | Losses |  |  | Value |
|  | (Thousands of dollars) |
Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market mutual funds |  | $ | 17,231 |  |  | $ | — |  |  | $ | — |  |  | $ | 17,231 |
Commercial paper |  |  | 12,408 |  |  |  | — |  |  |  | (15 | ) |  |  | 12,393 |
U.S. Government agencies |  |  | 28,299 |  |  |  | 13 |  |  |  | — |  |  |  | 28,312 |
Corporate bonds and notes |  |  | 244,196 |  |  |  | 191 |  |  |  | (65 | ) |  |  | 244,322 |
Subtotal |  |  | 302,134 |  |  |  | 204 |  |  |  | (80 | ) |  |  | 302,258 |
Deferred compensation plan assets included in other assets |  |  | 2,386 |  |  |  | — |  |  |  | — |  |  |  | 2,386 |
Total |  | $ | 304,520 |  |  | $ | 204 |  |  | $ | (80 | ) |  | $ | 304,644 |
Investments consisted of the following as of December 31, 2015:
|  |  |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost Basis |  |  | Gains |  |  | Losses |  |  | Value |
|  | (Thousands of dollars) |
Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market mutual funds |  | $ | 18,181 |  |  | $ | — |  |  | $ | — |  |  | $ | 18,181 |
Commercial paper |  |  | 5,986 |  |  |  | — |  |  |  | (5 | ) |  |  | 5,981 |
U.S. Government agencies |  |  | 11,499 |  |  |  | — |  |  |  | (30 | ) |  |  | 11,469 |
Corporate bonds and notes |  |  | 265,069 |  |  |  | — |  |  |  | (841 | ) |  |  | 264,228 |
Subtotal |  |  | 300,735 |  |  |  | — |  |  |  | (876 | ) |  |  | 299,859 |
Deferred compensation plan assets included in other assets |  |  | 2,294 |  |  |  | — |  |  |  | — |  |  |  | 2,294 |
Total |  | $ | 303,029 |  |  | $ | — |  |  | $ | (876 | ) |  | $ | 302,153 |
At June 30, 2016 and December 31, 2015, we classified $13.0 million and $15.3 million, respectively, of our aggregate investments as long-term investments and recorded them in our Condensed Consolidated Balance Sheets as Restricted investments, as they are securing outstanding letters of credit with maturities beyond one year. The following table presents the cost and fair value of our debt investments based on maturities as of:
|  | June 30, 2016 |  |  | December 31, 2015 |
|  | Amortized |  |  | Fair |  |  | Amortized |  |  | Fair |
|  | Costs |  |  | Value |  |  | Costs |  |  | Value |
|  | (Thousands of dollars) |
Due in one year or less |  | $ | 164,123 |  |  | $ | 164,071 |  |  | $ | 152,444 |  |  | $ | 152,212 |
Due within two years |  |  | 120,780 |  |  |  | 120,956 |  |  |  | 130,110 |  |  |  | 129,466 |
Total |  | $ | 284,903 |  |  | $ | 285,027 |  |  | $ | 282,554 |  |  | $ | 281,678 |
The following table presents the average coupon rate percentage and the average days to maturity of our debt investments as of:
|  | June 30, 2016 |  |  | December 31, 2015 |
|  | Average |  |  | Average |  |  | Average |  |  | Average |
|  | Coupon |  |  | Days To |  |  | Coupon |  |  | Days To |
|  | Rate (%) |  |  | Maturity |  |  | Rate (%) |  |  | Maturity |
Commercial paper |  |  | 0.932 |  |  |  | 279 |  |  |  | 0.553 |  |  |  | 154 |
U.S. Government agencies |  |  | 0.973 |  |  |  | 559 |  |  |  | 0.865 |  |  |  | 599 |
Corporate bonds and notes |  |  | 1.633 |  |  |  | 507 |  |  |  | 1.757 |  |  |  | 331 |
The following table presents the fair value and unrealized losses related to our investments that have been in a continuous unrealized loss position for less than twelve months as of:
|  | June 30, 2016 |  |  | December 31, 2015 |
|  |  |  |  | Unrealized |  |  |  |  |  | Unrealized |
|  | Fair Value |  |  | Losses |  |  | Fair Value |  |  | Losses |
|  | (Thousands of dollars) |
Commercial paper |  | $ | 12,394 |  |  | $ | (15 | ) |  | $ | 5,981 |  |  | $ | (5 | )
U.S. Government agencies |  |  | 5,505 |  |  |  | (1 | ) |  |  | 8,969 |  |  |  | (30 | )
Corporate bonds and notes |  |  | 85,084 |  |  |  | (33 | ) |  |  | 232,347 |  |  |  | (793 | )
Total |  | $ | 102,983 |  |  | $ | (49 | ) |  | $ | 247,297 |  |  | $ | (828 | )
The following table presents the fair value and unrealized losses related to our investments that have been in a continuous unrealized loss position for more than twelve months as of:
|  | June 30, 2016 |  |  | December 31, 2015 |
|  |  |  |  | Unrealized |  |  |  |  |  | Unrealized |
|  | Fair Value |  |  | Losses |  |  | Fair Value |  |  | Losses |
|  | (Thousands of dollars) |
Corporate bonds and notes |  | $ | 50,203 |  |  | $ | (31 | ) |  | $ | 28,866 |  |  | $ | (48 | )
Total |  | $ | 50,203 |  |  | $ | (31 | ) |  | $ | 28,866 |  |  | $ | (48 | )
From time to time over the periods covered in our financial statements included herein (and as illustrated in the foregoing tables), our investments have experienced net unrealized losses. We consider these declines in market value to be due to customary market fluctuations, and we do not plan to sell these investments prior to maturity. For these reasons, we do not consider any of our investments to be other than temporarily impaired at June 30, 2016 or December 31, 2015. We have also determined that we did not have any other-than-temporary impairments relating to credit losses on debt securities for the quarter ended June 30, 2016. For additional information regarding our criteria for making these assessments, see Note 2 to the financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2015.

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