| Summary of Valuation of Investments and Financial Instruments Pricing Levels |
The following table summarizes the valuation of our investments and
financial instruments by the above pricing levels as of the
valuation dates listed:
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
September 30, 2016 |
|
| |
|
Total |
|
|
(Level 1) |
|
|
(Level 2) |
|
| |
|
|
|
|
(Thousands of
dollars) |
|
|
Investments:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Money market mutual funds
|
|
$ |
17,608 |
|
|
$ |
17,608 |
|
|
$ |
— |
|
|
Commercial paper
|
|
|
32,745 |
|
|
|
— |
|
|
|
32,745 |
|
|
U.S. Government agencies
|
|
|
16,298 |
|
|
|
— |
|
|
|
16,298 |
|
|
Corporate bonds and notes
|
|
|
235,893 |
|
|
|
— |
|
|
|
235,893 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
302,544 |
|
|
|
17,608 |
|
|
|
284,936 |
|
|
Deferred compensation plan assets
|
|
|
2,392 |
|
|
|
2,392 |
|
|
|
— |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Total
|
|
$ |
304,936 |
|
|
$ |
20,000 |
|
|
$ |
284,936 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
December 31, 2015 |
|
| |
|
Total |
|
|
(Level 1) |
|
|
(Level 2) |
|
| |
|
|
|
|
(Thousands of
dollars) |
|
|
Investments:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Money market mutual funds
|
|
$ |
18,181 |
|
|
$ |
18,181 |
|
|
$ |
— |
|
|
Commercial paper
|
|
|
5,981 |
|
|
|
— |
|
|
|
5,981 |
|
|
U.S. Government agencies
|
|
|
11,469 |
|
|
|
— |
|
|
|
11,469 |
|
|
Corporate bonds and notes
|
|
|
264,228 |
|
|
|
— |
|
|
|
264,228 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
299,859 |
|
|
|
18,181 |
|
|
|
281,678 |
|
|
Deferred compensation plan assets
|
|
|
2,294 |
|
|
|
2,294 |
|
|
|
— |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Total
|
|
$ |
302,153 |
|
|
$ |
20,475 |
|
|
$ |
281,678 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|