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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2018
Fair Value Disclosures [Abstract] |
Schedule Of Assets And Liabilities Carried At Fair Value Measured On A Recurring Basis | The following tables provide the assets and liabilities carried at fair value measured on a recurring basis as of June 30, 2018 and December 31, 2017 (in thousands):
| Assets at Fair Value as of June 30, 2018
Asset Category | Level 1 |  | Level 2 |  | Level 3 |  | Total
Cash and cash equivalents (1) | $ | 306,624 |  |  | $ | — |  |  | $ | — |  |  | $ | 306,624 |
Restricted cash (2) | 2,572 |  |  | — |  |  | — |  |  | 2,572 |
Deferred compensation plan assets (3) | 24,159 |  |  | — |  |  | — |  |  | 24,159 |
Total | $ | 333,355 |  |  | $ | — |  |  | $ | — |  |  | $ | 333,355 |
| Assets at Fair Value as of December 31, 2017
Asset Category | Level 1 |  | Level 2 |  | Level 3 |  | Total
Cash and cash equivalents (1) | $ | 467,430 |  |  | $ | — |  |  | $ | — |  |  | $ | 467,430 |
Restricted cash (2) | 1,958 |  |  | — |  |  | — |  |  | 1,958 |
Deferred compensation plan assets (3) | 22,054 |  |  | — |  |  | — |  |  | 22,054 |
Total | $ | 491,442 |  |  | $ | — |  |  | $ | — |  |  | $ | 491,442 |
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(1) | Cash and cash equivalents include money market funds with original maturity dates of three months or less, which are Level 1 assets. At June 30, 2018 and December 31, 2017, we had $167.2 million and $194.2 million, respectively, in money market funds.
(2) | Restricted cash is classified as “Prepaid expenses and other” in the Condensed Consolidated Balance Sheets. Restricted cash primarily represents cash held in account for use on customer contracts.
(3) | Deferred compensation plan assets are classified as “Other assets” in the Condensed Consolidated Balance Sheets.

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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