Supplemental Disclosures to Consolidated Statements of Cash Flows (Supplemental Cash Flow Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]
Property and equipment	$ 1,211,392	$ 0	$ 0
Intangible assets not subject to amortization	1,538,544	0	0
Intangible assets subject to amortization	468,737	0	0
Receivables and other assets	254,436	0	0
Liabilities assumed	(2,233,177)	0	0
Deferred tax assets (liabilities)	(276,683)	0	0
Fair value of equity consideration	(1,111,206)	0	0
Cash paid (received) for acquisitions, net of cash acquired	(147,957)	0	0
Cash paid for interest, net of amounts capitalized	132,103	6	0
Non-cash additions for purchases of property and equipment	$ 15,916	$ 0	$ 0