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Revenue - Contract Assets and Liabilities From Contracts with Customers (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disaggregation of Revenue [Line Items] |  |
Contract liabilities | $ 911,395 | $ 1,310,813
Contract liabilities | 148,591 | 143,399
Accounts receivable, net |  |
Disaggregation of Revenue [Line Items] |  |
Contract assets | 43,541 | 43,092
Prepaid expenses and other current assets |  |
Disaggregation of Revenue [Line Items] |  |
Contract assets | 5,495 | 4,593
Other assets |  |
Disaggregation of Revenue [Line Items] |  |
Noncurrent other assets | 19,927 | 20,496
Other current liabilities |  |
Disaggregation of Revenue [Line Items] |  |
Contract liabilities | 8,530 | 5,171
Other liabilities |  |
Disaggregation of Revenue [Line Items] |  |
Contract liabilities | 24,614 | 0
Accrued expenses |  |
Disaggregation of Revenue [Line Items] |  |
Contract liabilities | $ 5,265 | $ 0

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