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Related Party Transactions - Related Party Activity (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
Restructuring Reserve [Roll Forward]  
Balance at December 31, 2017 $ 814,622
Charges (included in selling, general and administrative expenses) 7,534
Cash payments, net of sublease income (156,305)
Balance at June 30, 2018 $ 665,851