Summary of Significant Accounting Policies (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Cash Equivalents and Short-term Investments [Abstract]
Short-term investments	$ 15,769	$ 14,178
Trade Accounts Receivable [Abstract]
Past due threshold for individual collectability review	90 days
Property, Plant and Equipment [Abstract]
Initial term of long term evergreen contracts	10 years
Stock Split [Abstract]
Stock split		Board of Directors authorized a two-for-one stock split of the of the Company's outstanding common stock
Conversion ratio (in hundredths)		100.00%
Common stock par value (in dollars per share)	$ 0.1	$ 0.1
Buildings [Member]
Property, Plant and Equipment [Abstract]
Annual rates of depreciation, minimum (in hundredths)	3.00%
Annual rates of depreciation, maximum (in hundredths)	6.67%
Machinery and equipment [Member]
Property, Plant and Equipment [Abstract]
Annual rates of depreciation, minimum (in hundredths)	6.67%
Annual rates of depreciation, maximum (in hundredths)	12.50%
Furniture and fixtures [Member]
Property, Plant and Equipment [Abstract]
Annual rates of depreciation, minimum (in hundredths)	8.00%
Annual rates of depreciation, maximum (in hundredths)	12.50%
Computer equipment and software-related assets [Member]
Property, Plant and Equipment [Abstract]
Annual rates of depreciation, minimum (in hundredths)	12.50%
Annual rates of depreciation, maximum (in hundredths)	25.00%
PCC production facilities [Member]
Property, Plant and Equipment [Abstract]
Estimated useful life	15 years
Machinery and equipment for natural stone mining and processing plants and chemical plants [Member]
Property, Plant and Equipment [Abstract]
Estimated useful life	15 years