Balance Sheet Detail (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Balance Sheet Detail [Abstract]
Inventory, Raw Materials, Net of Reserves	$ 24,898	$ 17,848
Inventory, Work in Process, Net of Reserves	18,284	12,377
Inventory, Finished Goods, Net of Reserves	22,216	21,634
Inventory, Net	65,398	51,859
Machinery and Equipment, Gross	46,369	44,600
Leasehold Improvements, Gross	15,603	15,472
Furniture and Fixtures, Gross	14,619	14,394
Property, Plant and Equipment, Gross	76,591	74,466
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(59,311)	(53,540)
Property, Plant and Equipment, Net	17,280	20,926
Deferred Compensation Plan Assets	4,341	4,085
Other Inventory, Inventory at off Site Premises, Gross	5,022	6,296
Other Assets, Miscellaneous, Noncurrent	996	636
Other Assets, Noncurrent	10,359	11,017
Employee-related Liabilities, Current	6,417	6,619
Customer Advances and Deposits, Current	543	202
Product Warranty Accrual, Current	1,586	1,501
Capital Lease Obligations, Current	831	796
Other Accrued Liabilities, Current	2,769	2,184
Accrued expenses	12,146	11,302
Deferred Compensation Liability, Current and Noncurrent	5,247	4,919
Asset Retirement Obligation	2,540	2,397	$ 2,248
Deferred Revenue, Noncurrent	49	1,051
Capital Lease Obligations, Noncurrent	575	1,406
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	2,231	2,255
Accrued Income Taxes, Noncurrent	2,523	2,526
Deferred income tax liabilities - long term	0	224
Other Liabilities, Noncurrent Other	309	474
Liabilities, Noncurrent	$ 13,474	$ 15,252