Supplemental Financial Information (Tables)

12 Months Ended

Dec. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Noncash Investing and Financing Activities

Noncash Investing and Financing Activities

	For the years ended December 31,
	2018		2017			2016
	(In thousands)
Employee benefits paid in Class A common stock	$	7,605	$	11,200		$	11,126
Property and equipment financed under capital lease obligations	$	364	$	8,484		$	7,652
Increase (decrease) in capital expenditures included in accounts payable, net	$	7,318	$	(3,831	)	$	3,054
E	$	—	$	43,890		$	—
Noncash net assets exchanged for Tracking Stock (Note 1)	$	—	$	299,888		$	—

Schedule of Cost of Sales and Research and Development Costs

The table below summarizes the research and development costs incurred in connection with customers’ orders included in cost of sales and other expenses we incurred for research and development.

	For the years ended December 31,
	2018		2017		2016
	(In thousands)
Cost of sales	$	23,422	$	27,899	$	23,663
Research and development	$	27,570	$	31,745	$	31,170