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Description of Business and Significant Accounting Policies (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 USD ($) financial_institution | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) segment financial_institution | Jun. 30, 2018 USD ($) | Dec. 31, 2018 financial_institution
Schedule of Accounting Policies [Line Items] |  |  |  |  |
Renewal term |  |  | 1 year |  |
Number of reportable segments | segment |  |  | 2 |  |
Amortization period of inventories and supplies |  |  | 24 months |  |
Goodwill and intangible asset impairment |  |  | $ 0 | $ 0 |
Revenue | $ 462,101,000 | $ 501,587,000 | 938,212,000 | 1,002,149,000 |
Costs of services provided | 400,485,000 | 436,287,000 | 827,750,000 | 905,283,000 |
Investment and other income, net | $ 1,393,000 | 2,845,000 | $ 6,596,000 | 4,385,000 |
Number of financial institutions holding cash and cash equivalents and marketable securities | financial_institution | 1 |  | 1 |  | 1
Prior period adjustment |  |  |  |  |
Schedule of Accounting Policies [Line Items] |  |  |  |  |
Revenue |  | (2,100,000) |  | (3,400,000) |
Costs of services provided |  | (1,300,000) |  | (2,200,000) |
Investment and other income, net |  | $ (800,000) |  | $ (1,200,000) |

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