Acquisitions, Litigation, and Other Charges Acquisitions, Litigation, and Other Charges - Components of Charges (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Acquisition, Litigation and Other Special Charges [Abstract]
Acquisition related costs	$ 26,466	$ 24,284	$ 671
Litigation	310	4,553	0
Severance, equity award modifications and acceleration	1,089	9,789	2,053
Non-offering related equity issuance expenses	0	1,356	1,813
Terminated site operations costs	124	632	(1,804)
Non-recurring public company implementation costs	0	0	1,202
Cyber incident related costs	7,908	0	0
Other	409	0	0
Acquisition, litigation and other	$ 36,306	$ 40,614	$ 3,935