Income Taxes (Details 5) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets
Deferred compensation and retirement plan	$ 22,884	$ 25,432
Accrued expenses not deductible until paid	3,612	3,925
Employee stock-based compensation	3,709	1,182
Accrued payroll not deductible until paid	707	948
Accounts receivable, net	1,208	1,175
Other, net	417	280
Federal net operating loss carryforwards	0	130
Foreign net operating loss carryforwards	2,657	2,805
State net operating loss carryforwards	1,956	2,010
Foreign tax credit carryforwards	785	739
Capital loss carryforwards	6,278	7,182
Total gross deferred tax assets	44,213	45,808
Less valuation allowances	(9,958)	(10,933)
Net deferred tax assets	34,255	34,875
Deferred tax liabilities
Property, plant and equipment	(6,154)	(6,484)
Goodwill and other intangibles	(45,212)	(82,702)
Deferred Tax Liabilities, Other	(561)	(144)
Total gross deferred tax liabilities	(51,927)	(89,330)
Net deferred tax liabilities	(17,672)	(54,455)
Other Current Assets | New Accounting Pronouncement, Early Adoption, Effect
Operating Loss Carryforwards [Line Items]
Deferred tax asset	$ (3,700)	$ (5,100)