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Cash, Cash Equivalents and Marketable Securities (Notes) | 6 Months Ended
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Jun. 30, 2019
Cash, Cash Equivalents and Marketable Securities [Abstract] |
Cash, Cash Equivalents and Marketable Securities |
3. | Cash, Cash Equivalents and Marketable Securities
The following table summarizes our cash and investments in cash equivalents and marketable securities held by investment managers and overnight investments:
| June 30, 2019 |  | December 31, 2018
(in thousands) | Cash & Cash Equivalents | Marketable Securities | Total |  | Cash & Cash Equivalents | Marketable Securities | Total
Overnight holdings | $ | 292,464 |  | $ | — |  | $ | 292,464 |  |  | $ | 311,158 |  | $ | — |  | $ | 311,158 |
Investment holdings | 13,515 |  | 61,129 |  | 74,644 |  |  | 16,711 |  | 60,781 |  | 77,492 |
Cash in demand accounts | 39,915 |  | — |  | 39,915 |  |  | 33,207 |  | — |  | 33,207 |
Outstanding checks | (20,968 | ) | — |  | (20,968 | ) |  | (34,303 | ) | — |  | (34,303 | )
Total | $ | 324,926 |  | $ | 61,129 |  | $ | 386,055 |  |  | $ | 326,773 |  | $ | 60,781 |  | $ | 387,554 |
Our cash and overnight holdings fluctuate based on the timing of clients’ payroll processing cycles. Included in the cash, cash equivalents and marketable securities at June 30, 2019 and December 31, 2018 are $218.0 million and $224.5 million, respectively, of funds associated with federal and state income tax withholdings, employment taxes and other payroll deductions, as well as $37.4 million and $34.2 million in client prepayments, respectively.

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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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