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Description of Business and Significant Accounting Policies - Concentrations of Credit Risk and Significant Clients (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) financial_institution | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) financial_institution | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) financial_institution | Dec. 31, 2018 USD ($) financial_institution | Dec. 31, 2017 USD ($)
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of financial institutions holding cash and cash equivalents and marketable securities | financial_institution | 1 |  |  |  | 1 |  |  |  | 1 | 1 |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 446,960 | $ 455,606 | $ 462,101 | $ 476,111 | $ 494,952 | $ 505,500 | $ 501,587 | $ 500,562 | $ 1,840,778 | $ 2,002,601 | $ 1,861,206
Customer Concentration Risk | Revenue from Contract with Customer | Genesis |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 287,800 | $ 386,700 |
Capital expenditures |  |  |  |  |  |  |  |  | 15.60% | 19.30% |

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