Business Combinations - Narrative (Details)			12 Months Ended
	Oct. 01, 2020 USD ($) contact_center	May 04, 2020 USD ($)	Dec. 31, 2021 USD ($) company	Dec. 31, 2020 USD ($) company	Dec. 31, 2019 USD ($)
Business Acquisition [Line Items]
Reduction of acquisition earn-out contingent liability			$ 0	$ (3,105,000)	$ (16,543,000)
Contingent liabilities			$ 2,600,000	$ 0
Number of businesses acquired | company			0	2
Amortization expense, acquired intangible assets			$ 10,400,000	$ 9,500,000	$ 10,200,000
Trimax
Business Acquisition [Line Items]
Business acquisition, cost of acquired entity, cash paid		$ 9,900,000
Preferred interest, term		5 years
Maximum value of preferred interest		$ 9,900,000
AssureEdge
Business Acquisition [Line Items]
Business acquisition, cost of acquired entity, cash paid	$ 5,000,000
Number of contact centers | contact_center	6
Ownership percentage	70.00%