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Revenue Recognition - Contract Asset and Liability (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
Change in Contract with Customer, Asset [Abstract]  
Contract Assets at December 31, 2018 $ 83,188
Additions 62,987
Transfers to Accounts Receivable (25,078)
Contract Assets at September 30, 2019 121,097
Change in Contract with Customer, Liability [Abstract]  
Contract Liabilities at December 31, 2018 9,648
Contract Liabilities at September 30, 2019 7,972
Other Current Liabilities  
Change in Contract with Customer, Liability [Abstract]  
Contract Liabilities at December 31, 2018 9,648
Additions 305,985
Revenue Recognized (307,660)
Contract Liabilities at September 30, 2019 $ 7,973