Supplemental Financial Information - Noncash Investing and Financing Activities, Narrative and Research and Development (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Supplemental disclosure of cash flow information:
Cash paid for interest, net of amounts capitalized	$ 72,450	$ 120,625
Cash paid for income taxes	2,422	1,217
Non-cash investing and financing activities:
Employee benefits paid in Class A common stock	6,920	6,654
Increase (decrease) in capital expenditures included in accounts payable, net	2,055	(15,839)
Noncash net assets exchanged for BSS Transaction (Note 5)	$ (2,824)	$ 0