Fixed Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Fixed assets, gross	$ 63,351	$ 63,125
Less: Accumulated depreciation	(32,390)	(28,345)
Fixed assets, net	30,961	34,780
Depreciation expense	3,700	4,700	$ 5,600
Furniture, fixtures and equipment [Member]
Property, Plant and Equipment [Line Items]
Fixed assets, gross	25,132	25,442
Computer software [Member]
Property, Plant and Equipment [Line Items]
Fixed assets, gross	3,722	4,078
Computer hardware [Member]
Property, Plant and Equipment [Line Items]
Fixed assets, gross	3,795	3,427
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Fixed assets, gross	$ 30,702	$ 30,178
Minimum [Member] | Furniture, fixtures and equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated life	2 years
Minimum [Member] | Computer software [Member]
Property, Plant and Equipment [Line Items]
Estimated life	2 years
Minimum [Member] | Computer hardware [Member]
Property, Plant and Equipment [Line Items]
Estimated life	2 years
Minimum [Member] | Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated life	2 years
Maximum [Member] | Furniture, fixtures and equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated life	15 years
Maximum [Member] | Computer software [Member]
Property, Plant and Equipment [Line Items]
Estimated life	5 years
Maximum [Member] | Computer hardware [Member]
Property, Plant and Equipment [Line Items]
Estimated life	5 years
Maximum [Member] | Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated life	15 years