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Supplemental Disclosure to Cash Flows (Tables) | 12 Months Ended
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Dec. 31, 2019
Supplemental Cash Flow Elements [Abstract] |
Summary of Supplemental Non-Cash and Other Cash Flow Information | Supplemental non-cash and other cash flow information were as follows as of and for the years ended December 31 (in thousands):
| 2019 |  | 2018 |  | 2017
Supplemental disclosures: |  |  |  |  |
Cash and cash equivalents | $ | 172,250 |  |  | $ | 349,462 |  |  | $ | 75,105 |
Restricted cash | $ | 105 |  |  | $ | 1,565 |  |  | $ | 3,333 |
Total cash, cash equivalents and restricted cash shown in the statements of cash flows | $ | 172,355 |  |  | $ | 351,027 |  |  | $ | 78,438 |
Cash paid for income taxes, net of refunds | $ | 3,669 |  |  | $ | 10,609 |  |  | $ | 11,487 |
Non-cash transactions: |  |  |  |  |
Contingent consideration related to business combinations | $ | — |  |  | $ | — |  |  | $ | 1,007 |
Non-cash purchase consideration related to business combinations | — |  |  | 12,508 |  |  | — |
Property and equipment purchases in accounts payable | 834 |  |  | 501 |  |  | 133 |
Commission payable converted to stock-based award | 314 |  |  | — |  |  | — |

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