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Related Party Transactions - Redemption Rights (Details) - shares
1 Months Ended 12 Months Ended
Feb. 28, 2017
Dec. 31, 2018
Related Party Transaction [Line Items]    
Redemption ratio, number of shares of Class A Common stock for each Ranger unit redeemed   1
Ranger Bridge Loan    
Related Party Transaction [Line Items]    
Period after the consummation of an initial public offering that the debt may become due 10 days