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Consolidated and Combined Statements of Financial Condition (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounts Receivable, allowance for doubtful accounts $ 1,934 $ 4,374
Treasury Stock, Shares 60,333 0
Class A Common Stock    
Common Stock, Par or Stated Value Per Share $ 0.01 $ 0.01
Common Stock, Shares Authorized 3,000,000,000 3,000,000,000
Common Stock, Shares Issued 18,599,454 18,003,272
Common Stock, Shares Outstanding 18,539,121 18,003,272
Class B Common Stock    
Common Stock, Par or Stated Value Per Share $ 0.01 $ 0.01
Common Stock, Shares Authorized 1,000,000 1,000,000
Common Stock, Shares Issued 221 271
Common Stock, Shares Outstanding 221 271