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Acquisitions (Tables) | 12 Months Ended
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Dec. 31, 2017
Business Combinations [Abstract] |
Allocated Aggregate Purchase Price of Acquisitions | The following table summarizes the amounts of identifiable assets acquired, liabilities assumed and aggregate purchase price for the acquisitions in 2017, 2016 and 2015 (in thousands):
|  | 2017 |  |  | 2016 |  |  | 2015 |
Cash |  | $ | 843 |  |  | $ | 10 |  |  |  | — |
Accounts receivable, net |  |  | 4,338 |  |  |  | 6,649 |  |  |  | 1,501 |
Funds held for clients |  |  | — |  |  |  | 37,230 |  |  |  | — |
Property and equipment |  |  | 48 |  |  |  | 440 |  |  |  | — |
Other assets |  |  | 221 |  |  |  | 294 |  |  |  | 52 |
Identifiable intangible assets |  |  | 4,229 |  |  |  | 22,177 |  |  |  | 7,037 |
Accounts payable |  |  | (1,283 | ) |  |  | — |  |  |  | (62 | )
Accrued liabilities |  |  | (3,503 | ) |  |  | (1,133 | ) |  |  | (1,552 | )
Client fund obligations |  |  | — |  |  |  | (37,230 | ) |  |  | — |
Total identifiable net assets |  | $ | 4,893 |  |  | $ | 28,437 |  |  | $ | 6,976 |
Goodwill |  |  | 40,587 |  |  |  | 34,803 |  |  |  | 13,471 |
Aggregate purchase price |  | $ | 45,480 |  |  | $ | 63,240 |  |  | $ | 20,447 |

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- Definition Tabular disclosure of a material business combination completed during the period, including background, timing, and recognized assets and liabilities. This table does not include leveraged buyouts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1486-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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