Revenue Recognition (Contract Assets and Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change In Contract With Customer, Asset And Liability [Roll Forward]
Contract assets, net	$ 228,579
Contract liabilities	202,458
Amounts transferred from contract assets to receivables	(45,939)	$ (23,693)	$ 0
Contract assets, net	272,914	228,579
Contract liabilities	216,541	202,458
Contract Assets, net (Current)
Change In Contract With Customer, Asset And Liability [Roll Forward]
Contract Assets, net (Current)	228,579	219,361
Revenue recognized that was included in contract liabilities at the beginning of the period	0	0
Increase due to revenue recognized in the period in excess of billings	835,147	846,922
Increase due to billings arising during the period in excess of revenue recognized	0	0
Amounts transferred from contract assets to receivables	(785,279)	(815,213)
Currency effects and other, net, contract assets	(5,533)	(22,491)
Contract Assets, net (Current)	272,914	228,579	219,361
Long-term Contract Assets, net
Change In Contract With Customer, Asset And Liability [Roll Forward]
Contract assets, net	10,967	3,990
Revenue recognized that was included in contract liabilities at the beginning of the period	0	0
Increase due to revenue recognized in the period in excess of billings	0	6,668
Increase due to billings arising during the period in excess of revenue recognized	0	0
Amounts transferred from contract assets to receivables	(1,747)	(2,503)
Currency effects and other, net, contract assets	60	2,812
Contract assets, net	9,280	10,967	3,990
Contract Liabilities (Current)
Change In Contract With Customer, Asset And Liability [Roll Forward]
Contract liabilities	202,458	178,515
Revenue recognized that was included in contract liabilities at the beginning of the period	(125,274)	(123,458)
Increase due to revenue recognized in the period in excess of billings	0	0
Increase due to billings arising during the period in excess of revenue recognized	135,695	152,664
Amounts transferred from contract assets to receivables	0	0
Currency effects and other, net, contract liabilities	3,662	(5,263)
Contract liabilities	216,541	202,458	178,515
Long-term Contract Liabilities
Change In Contract With Customer, Asset And Liability [Roll Forward]
Long-term Contract Liabilities	1,652	1,370	$ 3,925
Revenue recognized that was included in contract liabilities at the beginning of the period	0	(1,360)
Increase due to revenue recognized in the period in excess of billings	0	0
Increase due to billings arising during the period in excess of revenue recognized	290	(481)
Amounts transferred from contract assets to receivables	0	0
Currency effects and other, net, contract liabilities	$ (8)	$ (714)