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Allowance for Expected Credit Losses (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Decrease to retained earnings |  |  | $ (3,658,158) | $ (3,670,543) |
Contract assets, allowance for credit loss as a percentage of assets |  |  | 1.00% |  |
Trade receivables |  |  |  |  |
Beginning balance | $ 73,829 | $ 66,252 | $ 73,829 | $ 75,176 | $ 53,412
Charges to cost and expenses, net of recoveries | (79) | 4,058 |  |  |
Currency effects and other, net | (1,268) | 1,491 |  |  |
Ending balance | 73,829 | 66,252 |  |  |
Contract assets |  |  |  |  |
Beginning balance | 3,205 | 206 |  |  |
Charges to cost and expenses, net of recoveries | 0 | 0 |  |  |
Currency effects and other, net | (66) | 72 |  |  |
Ending balance | 3,139 | 2,681 |  |  |
Long-term Receivables |  |  |  |  |
Beginning balance | 67,842 | 68,555 |  |  |
Currency effects and other, net | (1,059) | (574) |  |  |
Ending balance | 66,783 | 67,429 |  |  |
ASU No. 2016-13 - Measurement of Credit Losses on Financial Instruments (Topic 326) |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Decrease to retained earnings |  |  |  |  | 7,300
Trade receivables |  |  |  |  |
Beginning balance |  |  |  |  | $ 7,291
Contract assets |  |  |  |  |
Beginning balance |  | 2,403 |  |  |
Long-term Receivables |  |  |  |  |
Beginning balance | $ 0 | $ (552) |  |  |

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