Schedule of Balances Related to Property and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Property Plant And Equipment [Abstract]
Building and leasehold improvements	$ 5,100	$ 2,300
Equipment and furniture	89,200	89,600
Computer software	93,000	92,600
Property and Equipment, Gross	187,300	184,500
Less accumulated depreciation	(143,277)	(141,793)
Property and equipment, net	$ 43,963	$ 42,695