Acquisition (Details) (Acquisition of ILX Lightwave Corporation [Member], USD $) In Thousands, unless otherwise specified	Jan. 13, 2012
Assets acquired and liabilities assumed:
Cash	$ 44
Other assets	2,672
Goodwill	3,762
Liabilities	(2,485)
Assets acquired and liabilities assumed net, total	8,983
Developed technology [Member]
Assets acquired and liabilities assumed:
Intangible assets	2,800
Customer relationships [Member]
Assets acquired and liabilities assumed:
Intangible assets	1,100
Other intangible assets [Member]
Assets acquired and liabilities assumed:
Intangible assets	$ 1,090