Schedule of Balances Related to Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property Plant And Equipment [Abstract]
Building and leasehold improvements	$ 6,900	$ 2,300
Equipment and furniture	71,900	89,600
Computer software	96,800	92,600
Property and Equipment, Gross	175,600	184,500
Less accumulated depreciation	(138,650)	(141,793)
Property and equipment, net	$ 36,999	$ 42,695