Furniture, Equipment and Leasehold Improvements, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Furniture, equipment and leasehold improvements [Abstract]
Furniture, equipment and leasehold improvements, gross	$ 783,011	$ 787,768
Less: Accumulated depreciation and amortization	(623,447)	(627,408)
Furniture, equipment and leasehold improvements, net	159,564	160,360
Furniture and Equipment [Member]
Furniture, equipment and leasehold improvements [Abstract]
Furniture, equipment and leasehold improvements, gross	535,890	529,488
Leasehold Improvements [Member]
Furniture, equipment and leasehold improvements [Abstract]
Furniture, equipment and leasehold improvements, gross	$ 247,121	$ 258,280