Schedule of Balances Related to Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Property Plant And Equipment [Abstract]
Building and leasehold improvements	$ 6,600	$ 2,300
Equipment and furniture	85,400	89,600
Computer software	95,000	92,600
Property and Equipment, Gross	187,000	184,500
Less accumulated depreciation	(144,055)	(141,793)
Property and equipment, net	$ 42,960	$ 42,695