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Revenue Recognition (Contract Liabilities) (Details) - USD ($) $ in Thousands | 9 Months Ended
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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

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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130533-203044 + Details
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