September 30, 2012 |
|
Level 1 |
|
|
Level 2 |
|
|
Level 3 |
|
|
Total |
|
Cash |
|
$ |
165,754 |
|
|
$ |
- |
|
|
$ |
- |
|
|
$ |
165,754 |
|
Money market funds |
|
116,684 |
|
|
- |
|
|
- |
|
|
116,684 |
|
Certificates of deposit |
|
- |
|
|
17,015 |
|
|
- |
|
|
17,015 |
|
Municipal securities |
|
- |
|
|
253,899 |
|
|
- |
|
|
253,899 |
|
U.S. government agency securities |
|
- |
|
|
29,982 |
|
|
- |
|
|
29,982 |
|
Variable rate demand notes |
|
- |
|
|
6,501 |
|
|
- |
|
|
6,501 |
|
Auction rate securities |
|
- |
|
|
- |
|
|
20,755 |
|
|
20,755 |
|
Put option related to auction rate securities |
|
- |
|
|
- |
|
|
1,931 |
|
|
1,931 |
|
Total |
|
$ |
282,438 |
|
|
$ |
307,397 |
|
|
$ |
22,686 |
|
|
$ |
612,521 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Amounts included in: |
|
|
|
|
|
|
|
|
|
|
|
|
Cash and cash equivalents |
|
$ |
282,438 |
|
|
$ |
616 |
|
|
$ |
- |
|
|
$ |
283,054 |
|
Short-term investments |
|
- |
|
|
306,781 |
|
|
873 |
|
|
307,654 |
|
Investments |
|
- |
|
|
- |
|
|
19,882 |
|
|
19,882 |
|
Prepaid expenses and other current assets |
|
- |
|
|
- |
|
|
121 |
|
|
121 |
|
Other assets |
|
- |
|
|
- |
|
|
1,810 |
|
|
1,810 |
|
Total |
|
$ |
282,438 |
|
|
$ |
307,397 |
|
|
$ |
22,686 |
|
|
$ |
612,521 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
December 31, 2011 |
|
Level 1 |
|
|
Level 2 |
|
|
Level 3 |
|
|
Total |
|
Cash |
|
$ |
81,879 |
|
|
$ |
- |
|
|
$ |
- |
|
|
$ |
81,879 |
|
Money market funds |
|
230,029 |
|
|
- |
|
|
- |
|
|
230,029 |
|
U.S. Treasuries |
|
8,034 |
|
|
- |
|
|
- |
|
|
8,034 |
|
Certificates of deposit |
|
- |
|
|
69,078 |
|
|
- |
|
|
69,078 |
|
Corporate bonds |
|
- |
|
|
2,022 |
|
|
- |
|
|
2,022 |
|
Municipal securities |
|
- |
|
|
291,984 |
|
|
- |
|
|
291,984 |
|
U.S. government agency securities |
|
- |
|
|
16,005 |
|
|
- |
|
|
16,005 |
|
Variable rate demand notes |
|
- |
|
|
58,924 |
|
|
- |
|
|
58,924 |
|
Auction rate securities |
|
- |
|
|
- |
|
|
35,852 |
|
|
35,852 |
|
Put options related to auction rate securities |
|
- |
|
|
- |
|
|
3,041 |
|
|
3,041 |
|
Total |
|
$ |
319,942 |
|
|
$ |
438,013 |
|
|
$ |
38,893 |
|
|
$ |
796,848 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Amounts included in: |
|
|
|
|
|
|
|
|
|
|
|
|
Cash and cash equivalents |
|
$ |
311,908 |
|
|
$ |
47,423 |
|
|
$ |
- |
|
|
$ |
359,331 |
|
Short-term investments |
|
8,034 |
|
|
390,590 |
|
|
12,658 |
|
|
411,282 |
|
Investments |
|
- |
|
|
- |
|
|
23,194 |
|
|
23,194 |
|
Prepaid expenses and other current assets |
|
- |
|
|
- |
|
|
873 |
|
|
873 |
|
Other assets |
|
- |
|
|
- |
|
|
2,168 |
|
|
2,168 |
|
Total |
|
$ |
319,942 |
|
|
$ |
438,013 |
|
|
$ |
38,893 |
|
|
$ |
796,848 |
| |