Fixed Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Depreciation	$ 21,003	$ 20,890	$ 20,895
Property, Plant and Equipment, Gross	214,335	205,184
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(138,528)	(123,431)
Property, Plant and Equipment, Net	75,807	81,753
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	177,823	169,682
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	33,137	32,132
Land, Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 3,375	$ 3,370