Fixed Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Depreciation	$ 22,834	$ 22,698	$ 21,003
Property, Plant and Equipment, Gross	268,875	233,908
Development in Process	7,568	0
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(168,480)	(156,822)
Property, Plant and Equipment, Net	100,395	77,086
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	213,928	190,784
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	39,194	35,481
Land, Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 8,185	$ 7,643