XML 39 R28.htm IDEA: XBRL DOCUMENT
v3.21.2

Marketable Securities (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2021
Marketable Securities [Abstract] |
Schedule of Investments Available For Sale | Available For Sale and Equity Securities on the accompanying Consolidated Balance Sheets consist of:
| At September 30, 2021
| Cost Amount |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
Available-for-sale debt securities | $ | 126,964 |  |  | $ | 874 |  |  | $ | — |  |  | $ | 127,838 |
SEI-sponsored mutual funds | 6,692 |  |  | 380 |  |  | — |  |  | 7,072 |
Equities and other mutual funds | 4,932 |  |  | 237 |  |  | — |  |  | 5,169 |
| $ | 138,588 |  |  | $ | 1,491 |  |  | $ | — |  |  | $ | 140,079 |
| At December 31, 2020
| Cost Amount |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
Available-for-sale debt securities | $ | 91,262 |  |  | $ | 2,015 |  |  | $ | — |  |  | $ | 93,277 |
SEI-sponsored mutual funds | 6,866 |  |  | 382 |  |  | — |  |  | 7,248 |
Equities and other mutual funds | 4,421 |  |  | 473 |  |  | — |  |  | 4,894 |
| $ | 102,549 |  |  | $ | 2,870 |  |  | $ | — |  |  | $ | 105,419 |

X
- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_MarketableSecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration