Acquisitions (Details Textual) - USD ($)			1 Months Ended	12 Months Ended
	Jan. 02, 2020	Oct. 01, 2018	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Business acquisition, net of cash acquired				$ 11,491,000	$ 17,194,000	$ 144,791,000
Goodwill acquired				9,083,000
Forte Payment Systems, Inc
Business Acquisition [Line Items]
Business acquisition date					Oct. 01, 2018
Business acquisition, cash consideration		$ 93,000,000
Business acquisition, net of cash acquired		85,000,000
Cash initially held subject to certain tax filings		13,000,000
Potential future earn out payments		$ 18,800,000
Potential future earn out payments measurement period		4 years
Potential future earn out payments measurement date			Sep. 30, 2023
Accrued earn out payments			$ 2,400,000	2,400,000
Tekzenit, Inc.
Business Acquisition [Line Items]
Business acquisition date	Jan. 02, 2020
Business acquisition, cash consideration	$ 10,000,000
Potential future earn out payments	$ 10,000,000
Accrued earn out payments			0	0
Earn out and qualified sales payments measurement period	3 years
Contingent purchase price liabilities	$ 1,500,000		1,500,000	1,500,000
Goodwill acquired				9,100,000
Tekzenit, Inc. | Acquired Client Contracts
Business Acquisition [Line Items]
Acquired customer contracts			$ 2,900,000	$ 2,900,000
Tekzenit, Inc. | Contingent Purchase Price Payments
Business Acquisition [Line Items]
Potential future earn out payments	6,000,000
Tekzenit, Inc. | Financial And Sales Criteria
Business Acquisition [Line Items]
Potential future earn out payments	$ 4,000,000