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Revenue from Contracts with Customers - Contract Balances (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Revenue from External Customer [Line Items]    
Contract liabilities $ 179,237 $ 165,858
Contract assets 4,000 4,000
Prepaid expenses and other current assets / other assets, net    
Revenue from External Customer [Line Items]    
Contract assets, current 108,370 79,268
Accounts receivable, net    
Revenue from External Customer [Line Items]    
Contract assets, current 577,023 501,467
Other assets, net    
Revenue from External Customer [Line Items]    
Contract assets, noncurrent $ 49,810 $ 50,467