Condensed Consolidated Statements of Cash Flows Supplemental Information - Significant Non-cash Investing Activities - (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Net increase (decrease) in accruals related to:
Investment in equipment supporting joint revenue sharing arrangements	$ 1,133	$ 117
Acquisition of other intangible assets	32	(858)
Net accruals	$ 1,165	$ (741)