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Revenue Recognition (Adoption of ASC 606) - Contract Asset and Liability (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
Change in Contract with Customer, Asset [Abstract]  
Contract Assets at December 31, 2017 $ 41,825
Additions 94,912
Transfers to Accounts Receivable 65,713
Contract Assets at June 30, 2018 71,024
Change in Contract with Customer, Liability [Abstract]  
Contract Liabilities at December 31, 2017 4,767
Additions 20,457
Revenue Recognized 20,502
Contract Liabilities at June 30, 2018 $ 4,722