Acquisitions, Litigation, and Other Charges - Components of Charges (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Acquisition, Litigation and Other Special Charges [Abstract]
Acquisition related costs	$ 2,651	$ 15,014	$ 3,417	$ 16,455
Litigation	0	467	0	1,377
Other:
Severance, equity award modifications and acceleration	150	2,641	1,072	6,934
Non-offering related equity issuance expenses	0	(164)	0	1,347
Terminated site operations costs	0	6	0	344
Total other	150	2,483	1,072	8,625
Total acquisition, litigation and other	$ 2,801	$ 17,964	$ 4,489	$ 26,457