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Revenue Recognition (Adoption of ASC 606) - Contract Asset and Liability (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Change in Contract with Customer, Asset [Abstract]  
Contract Assets at December 31, 2017 $ 41,825
Additions 63,379
Transfers to Accounts Receivable (22,016)
Contract Assets at December 31, 2018 83,188
Change in Contract with Customer, Liability [Abstract]  
Contract Liabilities at December 31, 2017 4,767
Additions 114,236
Revenue Recognized (109,355)
Contract Liabilities at December 31, 2018 $ 9,648