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Cash, Cash Equivalents and Marketable Securities | 12 Months Ended
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Dec. 31, 2019
Cash, Cash Equivalents and Marketable Securities [Abstract] |
Cash, Cash Equivalents and Marketable Securities |
2. | Cash, Cash Equivalents and Marketable Securities
The following table summarizes our investments in cash equivalents and marketable securities held by investment managers and overnight investments:
| December 31,
| 2019 |  | 2018
(in thousands) | Cash & Cash Equivalents | Marketable Securities | Total |  | Cash & Cash Equivalents | Marketable Securities | Total
Overnight holdings | $ | 349,857 |  | $ | — |  | $ | 349,857 |  |  | $ | 311,158 |  | $ | — |  | $ | 311,158 |
Investments holdings | 13,218 |  | 34,728 |  | 47,946 |  |  | 16,711 |  | 60,781 |  | 77,492 |
Cash in demand accounts | 36,521 |  | — |  | 36,521 |  |  | 33,207 |  | — |  | 33,207 |
Outstanding checks | (32,254 | ) | — |  | (32,254 | ) |  | (34,303 | ) | — |  | (34,303 | )
Total | $ | 367,342 |  | $ | 34,728 |  | $ | 402,070 |  |  | $ | 326,773 |  | $ | 60,781 |  | $ | 387,554 |
Our cash and overnight holdings fluctuate based on the timing of the client’s payroll processing cycle. Included in the cash balance as of December 31, 2019 and December 31, 2018, are $234.6 million and $224.5 million, respectively, in withholdings associated with federal and state income taxes, employment taxes and other payroll deductions, as well as $59.6 million and $34.2 million, respectively, in client prepayments.

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- Definition The entire disclosure of cash, cash equivalents, and debt and equity securities, including any unrealized or realized gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 305 -URI http://asc.fasb.org/topic&trid=2122426 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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