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Consolidated Statements of Financial Condition (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Accumulated depreciation and amortization on fixed assets $ 59,905 $ 55,944
Accumulated amortization on intangible assets $ 90,647 $ 85,417
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 19,516,573 19,512,914
Common stock, shares outstanding 13,334,389 12,911,149
Common stock held in treasury, shares 6,182,184 6,601,765