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Revenue Recognition (Contract Liabilities) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Change In Contract With Customer, Asset And Liability [Roll Forward]    
Contract Assets, Beginning balance $ 277,734  
Contract Liabilities, Current, Beginning balance 194,227  
Revenue recognized that was included in contract liabilities at the beginning of the period (9,379) $ 22,468
Amounts transferred from contract assets to receivables 35,358 (37,328)
Contract Assets, Ending balance 235,917 310,130
Contract Liabilities, Current, Ending balance 199,103 198,380
Short-term Contract with Customer    
Change In Contract With Customer, Asset And Liability [Roll Forward]    
Contract Assets, Beginning balance 277,734 272,914
Revenue recognized that was included in contract liabilities at the beginning of the period 0 0
Revenue recognized in the period in excess of billings 539,813 654,967
Billings arising during the period in excess of revenue recognized 0 0
Amounts transferred from contract assets to receivables (563,145) (606,564)
Other contract asset, net (18,485) (11,187)
Long-term Contract with Customer    
Change In Contract With Customer, Asset And Liability [Roll Forward]    
Contract Assets, Beginning balance 1,139 9,280
Revenue recognized that was included in contract liabilities at the beginning of the period 0 0
Revenue recognized in the period in excess of billings 0 0
Billings arising during the period in excess of revenue recognized 0 0
Amounts transferred from contract assets to receivables (61) 191
Other contract asset, net (109) (6,585)
Contract Assets, Ending balance 969 2,886
Short-term Contract with Customer, Liability    
Change In Contract With Customer, Asset And Liability [Roll Forward]    
Contract Liabilities, Current, Beginning balance 194,227 221,095
Revenue recognized that was included in contract liabilities at the beginning of the period (137,305) (159,376)
Revenue recognized in the period in excess of billings 0 0
Billings arising during the period in excess of revenue recognized 145,369 137,986
Amounts transferred from contract assets to receivables 0 0
Other contract liability, net (3,188) (1,325)
Long-term Contract With Customer, Liability    
Change In Contract With Customer, Asset And Liability [Roll Forward]    
Contract Liabilities, Noncurrent, Beginning balance 822 1,652
Revenue recognized that was included in contract liabilities at the beginning of the period 0 (1,198)
Revenue recognized in the period in excess of billings 0 0
Billings arising during the period in excess of revenue recognized 0 309
Amounts transferred from contract assets to receivables 0 0
Other contract liability, net (40) 15
Contract Liabilities, Noncurrent, Ending balance $ 782 $ 778