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Cash, Cash Equivalents and Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2016
Cash, Cash Equivalents and Marketable Securities [Abstract] |
Summary of investments in 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,
|  | 2016 |  | 2015
|  | (in thousands)
Overnight holdings: |  |  |  |
Money market funds (cash equivalents) |  | $ | 255,091 |  |  | $ | 247,720 |
Investment holdings: |  |  |  |
Money market funds (cash equivalents) |  | 28,231 |  |  | 26,048 |
Marketable securities |  | 1,851 |  |  | 9,875 |
|  | 285,173 |  |  | 283,643 |
Cash held in demand accounts |  | 25,758 |  |  | 19,377 |
Outstanding checks |  | (23,046 | ) |  | (23,607 | )
Total cash, cash equivalents and marketable securities |  | $ | 287,885 |  |  | $ | 279,413 |
Cash and cash equivalents |  | $ | 286,034 |  |  | $ | 269,538 |
Marketable securities |  | 1,851 |  |  | 9,875 |
|  | $ | 287,885 |  |  | $ | 279,413 |
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, 2016 and December 31, 2015, are $221.7 million and $185.7 million, respectively, in withholdings associated with federal and state income taxes, employment taxes and other payroll deductions, as well as $21.3 million and $17.0 million, respectively, in client prepayments.

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- Definition The entire disclosure for cash and cash equivalent footnotes, which may include the types of deposits and money market instruments, applicable carrying amounts, restricted amounts and compensating balance arrangements. Cash and equivalents include: (1) currency on hand (2) demand deposits with banks or financial institutions (3) other kinds of accounts that have the general characteristics of demand deposits (4) short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments maturing within three months from the date of acquisition qualify. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4273-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 6.H.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13728-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 + Details
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