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Consolidated Financial Statement Details (Components of Accrued Expenses and Other Liabilities) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Taxes payable | [1] | $ 14,310 | $ 19,577
Accrued legal costs |  | 17,796 | 4,808
Operating lease liabilities, current portion |  | 7,856 | 9,359
Customer credit balances |  | 5,816 | 5,874
Accrued commissions and salaries |  | 4,970 | 5,010
Unrecognized tax benefit |  | 3,563 | 3,351
Accrued health care costs |  | 2,526 | 2,341
Accrued vacation costs |  | 2,206 | 2,311
Derivative instruments |  | 138 | 4,159
Other liabilities |  | 5,966 | 6,304
Total accrued expenses and other liabilities |  | 65,147 | 63,094
Less: Long-term portion |  | 9,339 | 10,866
Accrued expenses and other current liabilities |  | $ 55,808 | $ 52,228
[1] | We deferred payments of the employer's portion of Social Security taxes during 2020 under the Coronavirus, Aid, Relief and Economic Security Act ("CARES Act"), half of which is due by the end of calendar year 2021 with the remainder due by the end of calendar year 2022.

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