Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for doubtful accounts receivables	$ 16,386	$ 12,882	$ 23,540	$ 28,777
Property, accumulated amortization and depreciation	286,001	265,506
Goodwill and other intangible assets, accumulated amortization	$ 60,080	$ 57,561
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	7,628,786	4,253,381
Series A Preferred Stock [Member]
Preferred stock, shares issued	0	7,921
Preferred stock, shares outstanding	0	7,921
Series B Preferred Stock [Member]
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0