Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities - Summary of Significant Non-Cash Investing and Financing Activities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Significant non-cash investing and financing activities
Other payable issued for purchased customer accounts	$ 1,547	$ 608
Estimated acquisition earn-out payables and related charges	$ 13,978	$ 18,155