Fixed Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Intangible assets, accumulated amortization (in dollars)	$ 29,418	$ 28,301
Other Depreciation and Amortization	7,700	6,800	$ 6,600
Property, Plant and Equipment, Gross	66,275	57,184
Less: Accumulated depreciation and amortization	(23,867)	(29,953)
Fixed assets, net	42,408	27,231
Telephone and computer equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	2,787	6,521
Computer software
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	2,167	1,680
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,204	6,131
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	35,092	35,215
Assets acquired under capital leases-equipment
Property, Plant and Equipment [Line Items]
Intangible assets, accumulated amortization (in dollars)	2,400
Property, Plant and Equipment, Gross	4,075	7,637
Depreciation	1,200	1,500	$ 1,500
Aircraft and related equipment
Property, Plant and Equipment [Line Items]
Intangible assets, accumulated amortization (in dollars)	1,700
Property, Plant and Equipment, Gross	20,893	0
Depreciation	1,700
Other
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 57	$ 0