Schedule of Investments at Fair Value on Recurring Basis |
Investments carried at fair value are categorized into one of the
three categories described above and consisted of the following (in
thousands):
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
September 30, 2016 |
|
|
December 31, 2015 |
|
|
|
Fair
Value |
|
|
Level 1 |
|
|
Level 2 |
|
|
Level 3 |
|
|
Fair
Value |
|
|
Level 1 |
|
|
Level 2 |
|
|
Level 3 |
|
Assets held in rabbi trust
|
|
$ |
7,309 |
|
|
$ |
— |
|
|
$ |
7,309 |
|
|
$ |
— |
|
|
$ |
5,661 |
|
|
$ |
— |
|
|
$ |
5,661 |
|
|
$ |
— |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Money market funds (1)
|
|
$ |
60,513 |
|
|
$ |
60,513 |
|
|
$ |
— |
|
|
$ |
— |
|
|
$ |
5,987 |
|
|
$ |
5,987 |
|
|
$ |
— |
|
|
$ |
— |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Marketable securities, available-for-sale:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Short-term investments:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
U.S. Treasuries
|
|
$ |
24,878 |
|
|
$ |
24,878 |
|
|
$ |
— |
|
|
$ |
— |
|
|
$ |
62,272 |
|
|
$ |
62,272 |
|
|
$ |
— |
|
|
$ |
— |
|
U.S. Government Sponsored Entities
|
|
|
11,513 |
|
|
|
— |
|
|
|
11,513 |
|
|
|
— |
|
|
|
17,559 |
|
|
|
— |
|
|
|
17,559 |
|
|
|
— |
|
Corporate debt securities
|
|
|
11,986 |
|
|
|
— |
|
|
|
11,986 |
|
|
|
— |
|
|
|
— |
|
|
|
— |
|
|
|
— |
|
|
|
— |
|
Asset-backed securities and other
|
|
|
— |
|
|
|
— |
|
|
|
— |
|
|
|
— |
|
|
|
29 |
|
|
|
— |
|
|
|
29 |
|
|
|
— |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ |
48,377 |
|
|
$ |
24,878 |
|
|
$ |
23,499 |
|
|
$ |
— |
|
|
$ |
79,860 |
|
|
$ |
62,272 |
|
|
$ |
17,588 |
|
|
$ |
— |
|
Long-term investments:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
U.S. Treasuries
|
|
$ |
50,698 |
|
|
$ |
50,698 |
|
|
$ |
— |
|
|
$ |
— |
|
|
$ |
15,171 |
|
|
$ |
15,171 |
|
|
$ |
— |
|
|
$ |
— |
|
U.S. Government Sponsored Entities
|
|
|
16,014 |
|
|
|
— |
|
|
|
16,014 |
|
|
|
— |
|
|
|
12,022 |
|
|
|
— |
|
|
|
12,022 |
|
|
|
— |
|
Corporate debt securities
|
|
|
18,769 |
|
|
|
— |
|
|
|
18,769 |
|
|
|
— |
|
|
|
16,705 |
|
|
|
— |
|
|
|
16,705 |
|
|
|
— |
|
Asset-backed securities and other
|
|
|
8,798 |
|
|
|
— |
|
|
|
8,798 |
|
|
|
— |
|
|
|
10,497 |
|
|
|
— |
|
|
|
10,497 |
|
|
|
— |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ |
94,279 |
|
|
$ |
50,698 |
|
|
$ |
43,581 |
|
|
$ |
— |
|
|
$ |
54,395 |
|
|
$ |
15,171 |
|
|
$ |
39,224 |
|
|
$ |
— |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
(1) |
Included in cash and cash
equivalents. |
|