Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment, Net, by Type [Abstract]
Gross property, plant and equipment	$ 283,234	$ 231,432
Accumulated depreciation	(125,405)	(121,560)
Total property, plant and equipment, net	157,829	109,872
Land [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Gross property, plant and equipment	25,535	7,806
Building and Building Improvements [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Gross property, plant and equipment	36,778	21,645
Leasehold Improvements [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Gross property, plant and equipment	23,948	16,503
Machinery and Equipment [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Gross property, plant and equipment	103,180	108,982
Demonstration Systems [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Gross property, plant and equipment	44,700	29,986
Other Fixed Assets [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Gross property, plant and equipment	$ 49,093	$ 46,510