Revenue Recognition (Contract with Customer, Asset and Liability) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Accounts receivable (including long-term, included in Other assets)	$ 1,014,956	$ 1,121,834
Contract assets, short-term (included in Other current assets)	4,373	7,283
Contract assets, long-term (included in Other assets)	3,225	9,964
Contract liabilities (Deferred revenue)	$ 61,557	$ 63,921