Products, Services and Other Revenues (Schedule Of Receivables And Customer Deposits Related To Contracts With Customers) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Other Revenue [Line Items]
Document Period End Date	Jun. 30, 2019
Receivables	$ 2,191,947	$ 1,692,526
Contracts With Customers [Member]
Other Revenue [Line Items]
Receivables	375,038	247,532
Customer deposits	$ 70,785	$ 48,238