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Revenue Recognition - Contract Asset and Liability (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Change in Contract with Customer, Asset [Abstract]  
Contract Assets at December 31, 2018 $ 83,188
Additions 39,447
Transfers to Accounts Receivable (19,090)
Contract Assets at March 31, 2019 103,545
Change in Contract with Customer, Liability [Abstract]  
Contract Liabilities at December 31, 2018 9,648
Contract Liabilities at March 31, 2019 12,834
Other Current Liabilities  
Change in Contract with Customer, Liability [Abstract]  
Contract Liabilities at December 31, 2018 9,648
Additions 59,090
Revenue Recognized (55,906)
Contract Liabilities at March 31, 2019 $ 12,832