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Supplemental Information - Balance Sheets (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Quantifying Misstatement in Current Year Financial Statements [Line Items] |  |  |  |
Accounts Receivable, after Allowance for Credit Loss, Current | $ 377,670 | $ 374,892 |  |
Goodwill | 669,060 | 668,211 |  |
Assets | 1,560,713 | 1,511,312 |  |
Accruals and other liabilities | 242,667 | 274,968 |  |
Liabilities | 1,940,944 | 1,893,085 |  |
Accumulated deficit | (704,741) | (709,751) |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (405,583) | (408,910) | $ (183,944) | $ (190,575)
Liabilities and Equity | $ 1,560,713 | $ 1,511,312 |  |

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