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General	12 Months Ended
	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
General	1. General CSG Systems International, Inc. (the “Company”, “CSG”, or forms of the pronoun “we”), a Delaware corporation, was formed in October 1994 and is based in Denver, Colorado. We are a purpose-driven, SaaS platform company with revenue management and digital monetization, customer experience, and payments solutions serving a wide variety of industry verticals. Our cloud-first architecture and customer-centric approach help companies around the world acquire, monetize, engage, and retain their B2B (business-to-business), B2C (business-to-consumer), and B2B2X (business-to-business-to-consumer) customers. Over the years, we have focused our research and development (“R&D”) and acquisition investments on expanding our solution set to address the complex, transformative needs of our customers. We are a member of the S&P SmallCap 600 and Russell 2000 indices. The accompanying Consolidated Financial Statements (“Financial Statements”) are prepared in conformity with generally accepted accounting principles (“GAAP”) in the United States of America (“U.S.”).

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The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

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