Annual report pursuant to Section 13 and 15(d)

Acquisitions Acquisition of 2M-Tek (Details)

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Acquisitions Acquisition of 2M-Tek (Details) - April 17, 2015 Acquisition [Member] - USD ($)
$ in Thousands
Apr. 18, 2015
Dec. 31, 2016
Dec. 31, 2015
Apr. 17, 2015
Business Acquisition [Line Items]        
Payments to Acquire Businesses, Gross $ 10,448      
Business Combination, Contingent Consideration, Liability       $ 8,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred $ 17,200      
Fair Value of Contingent Consideration   $ 4,000 $ 2,000 $ 6,755