Description of Business and Significant Accounting Policies (Details)	3 Months Ended
	Mar. 31, 2020 USD ($) financial_institution segment	Mar. 31, 2019 USD ($)	Dec. 31, 2019 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
Number of financial institutions holding cash and cash equivalents and marketable securities | financial_institution	1		1
Revenue	$ 449,150,000	476,111,000
Costs of services provided	387,156,000	427,265,000
Investment and other income, net	$ (4,827,000)	$ 5,203,000
Minimum
Schedule of Accounting Policies [Line Items]
Cancellation notice period	30 days
Initial period preceding cancellation notice	60 days
Revenue, Performance Obligation, Payment Terms	1 year
Maximum
Schedule of Accounting Policies [Line Items]
Cancellation notice period	90 days
Initial period preceding cancellation notice	120 days
Revenue, Performance Obligation, Payment Terms	3 years