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Cash, Cash Equivalents and Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2018
Cash, Cash Equivalents and Marketable Securities [Abstract] |
Summary of investments in 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:
| September 30, 2018 |  | December 31, 2017
(in thousands) | Cash & Cash Equivalents | Marketable Securities | Total |  | Cash & Cash Equivalents | Marketable Securities | Total
Overnight holdings | $ | 270,172 |  | $ | — |  | $ | 270,172 |  |  | $ | 338,112 |  | $ | — |  | $ | 338,112 |
Investments holdings | 43,989 |  | 37,576 |  | 81,565 |  |  | 22,634 |  | 1,960 |  | 24,594 |
Cash in demand accounts | 29,585 |  | — |  | 29,585 |  |  | 26,700 |  | — |  | 26,700 |
Outstanding checks | (15,447 | ) | — |  | (15,447 | ) |  | (33,186 | ) | — |  | (33,186 | )
Total | $ | 328,299 |  | $ | 37,576 |  | $ | 365,875 |  |  | $ | 354,260 |  | $ | 1,960 |  | $ | 356,220 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 305 -URI http://asc.fasb.org/topic&trid=2122426 + Details
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