FIXED ASSETS (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment
Fixed assets	$ 153,140	$ 138,422
Accumulated depreciation	(50,859)	(45,344)
Fixed assets, net	102,281	93,078
Furniture, equipment and capitalized software
Property, Plant and Equipment
Fixed assets	23,417	18,771
Leasehold improvements
Property, Plant and Equipment
Fixed assets	58,521	49,626
Corporate aircraft
Property, Plant and Equipment
Fixed assets	66,277	66,277
Other
Property, Plant and Equipment
Fixed assets	$ 4,925	$ 3,748