Balance Sheet Detail (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Balance Sheet Detail [Abstract]
Inventory, Raw Materials, Net of Reserves	$ 19,800	$ 19,597
Inventory, Work in Process, Net of Reserves	9,435	9,708
Inventory, Finished Goods, Net of Reserves	18,549	17,489
Inventory, Net	47,784	46,794
Machinery and Equipment, Gross	42,035	37,598
Leasehold Improvements, Gross	15,434	14,141
Furniture and Fixtures, Gross	15,229	13,458
Property, Plant and Equipment, Gross	72,698	65,197
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(50,887)	(45,396)
Property, Plant and Equipment, Net	21,811	19,801
Deferred Compensation Plan Assets	3,242	2,070
Other Inventory, Inventory at off Site Premises, Gross	7,777	1,422
Other Assets, Miscellaneous, Noncurrent	841	1,340
Other Assets, Noncurrent	11,860	4,832
Employee-related Liabilities, Current	8,771	10,359
Customer Advances and Deposits, Current	2,522	29
Product Warranty Accrual, Current	1,142	2,273
Capital Lease Obligations, Current	0	15
Other Accrued Liabilities, Current	2,660	2,184
Accrued expenses	15,095	14,860
Deferred Compensation Liability, Current and Noncurrent	3,874	2,477
Asset Retirement Obligation	2,248	2,123	1,925
Deferred Revenue, Noncurrent	1,460	1,631
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	1,032	967
Accrued Income Taxes, Noncurrent	2,574	3,710
Deferred income tax liabilities - long term	125	0
Other Liabilities, Noncurrent Other	610	327
Liabilities, Noncurrent	$ 11,923	$ 11,235