Income Taxes (Details 3) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets
Deferred compensation and retirement plan	$ 18,067	$ 16,179
Accrued expenses not deductible until paid	2,331	1,584
Lease liability	4,217
Employee stock-based compensation	736	780
Accrued payroll not deductible until paid	196	428
Accounts receivable, net	156	100
Investment in foreign subsidiaries, outside basis difference	1,336	1,322
Goodwill	649	710
Other, net	156	142
Foreign net operating loss carryforwards	2,364	3,042
State net operating loss carryforwards	4,387	3,776
Foreign tax credit carryforwards	3,653	3,653
Federal net operating loss carryforwards	5,394	2,507
Total gross deferred tax assets	43,642	34,223
Less valuation allowances	(38,379)	(31,170)
Net deferred tax assets	5,263	3,053
Deferred tax liabilities
Property, plant and equipment	(1,159)	(1,689)
Right-of-use asset	(3,785)
Prepaid Expenses	(279)	(331)
Other, net	(284)	(281)
Total gross deferred tax liabilities	(5,507)	(2,301)
Net deferred tax (liabilities) assets	$ 244
Net deferred tax (liabilities) assets		$ 752