Income Taxes (Deferred Tax Assets and Liabilities) (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Components of Deferred Tax Assets [Abstract]
Inventory	$ 4,370,000	$ 4,288,000
Net operating losses	191,000	0
Capitalized research and development	2,410,000	4,561,000
Deferred compensation	2,905,000	2,631,000
Accounts receivable	2,759,000	2,968,000
Employee benefits	5,915,000	5,984,000
Accrued pension	9,020,000	9,530,000
Research and development credit	3,378,000	1,696,000
Other	3,973,000	2,604,000
Deferred tax asset	34,921,000	34,262,000
Components of Deferred Tax Liabilities [Abstract]
Goodwill and intangible assets	111,770,000	101,514,000
Depreciation	13,146,000	9,500,000
State taxes	4,157,000	2,975,000
Contingent interest	378,000	386,000
Deferred tax liabilities	129,451,000	114,375,000
Net liabilitiy	(94,530,000)	(80,113,000)
Investments in Foreign Subsidiaries and Foreign Corporate Joint Ventures that are Essentially Permanent in Duration [Member]
Deferred Tax Liability Not Recognized [Line Items]
Cumulative amount of temporary difference	$ 58,800,000