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Condensed Consolidated Statements of Financial Condition (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Allowance for doubtful accounts receivables $ 34,956 $ 23,746
Property, accumulated amortization and depreciation 325,012 317,827
Other intangible assets, accumulated amortization $ 64,681 $ 63,099
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 15,000,000 15,000,000
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 500,000,000 500,000,000
Common stock, shares issued 129,766,091 129,766,091
Common stock held by subsidiaries, shares 9,719,895 10,747,142
Series A Preferred Stock [Member]    
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Series B Preferred Stock [Member]    
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0