Annual report pursuant to Section 13 and 15(d)

Basis of Presentation - Acquisition of Delta Topco (Details)

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Basis of Presentation - Acquisition of Delta Topco (Details)
Jan. 23, 2017
Sep. 07, 2016
Delta Topco    
Business Acquisition [Line Items]    
Interest acquired (as a percent) 100.00% 20.00%