Balance Sheet Information (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment
Gross property, plant, and equipment at cost	$ 177,860,000	$ 155,390,000
Less accumulated depreciation and amortization	79,558,000	69,323,000
Net property, plant and equipment	98,302,000	86,067,000
Depreciation expense	11,300,000	8,200,000	7,100,000
Goodwill
Balance at the beginning of the period	55,828,000	52,003,000
Write-off		(10,836,000)
Acquisition		14,661,000
Balance at the end of the period	55,828,000	55,828,000	52,003,000
Indefinite-lived intangible assets
Indefinite-lived trademarks and tradenames	2,900,000	2,900,000
Land
Property, Plant and Equipment
Gross property, plant, and equipment at cost	12,535,000	12,535,000
Building and improvements
Property, Plant and Equipment
Gross property, plant, and equipment at cost	49,498,000	34,589,000
Building and improvements | Minimum
Property, Plant and Equipment
Estimated useful lives	10 years
Building and improvements | Maximum
Property, Plant and Equipment
Estimated useful lives	40 years
Machinery and equipment
Property, Plant and Equipment
Gross property, plant, and equipment at cost	110,150,000	102,241,000
Machinery and equipment | Minimum
Property, Plant and Equipment
Estimated useful lives	3 years
Machinery and equipment | Maximum
Property, Plant and Equipment
Estimated useful lives	10 years
Leaseholds improvements
Property, Plant and Equipment
Gross property, plant, and equipment at cost	$ 5,677,000	$ 6,025,000
Leaseholds improvements | Minimum
Property, Plant and Equipment
Estimated useful lives	3 years
Leaseholds improvements | Maximum
Property, Plant and Equipment
Estimated useful lives	7 years