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Revenue from Contracts with Customers - Contract Balances (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Revenue from External Customer [Line Items]    
Contract assets, noncurrent $ 86,610 $ 105,461
Contract assets 8,000 6,000
Other accrued liabilities    
Revenue from External Customer [Line Items]    
Contract assets, current 88,850 105,499
Accounts receivable, net    
Revenue from External Customer [Line Items]    
Contract assets, current 253,511 539,806
Other noncurrent liabilities    
Revenue from External Customer [Line Items]    
Contract assets, noncurrent 38,156 38,250
Deferred revenues / other noncurrent liabilities    
Revenue from External Customer [Line Items]    
Contract liabilities $ 176,956 $ 167,832