Quarterly report pursuant to Section 13 or 15(d)

Acquisitions ITS - Narrative (Details)

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Acquisitions ITS - Narrative (Details) - April 17, 2015 Acquisition [Member] - USD ($)
$ in Thousands
Apr. 18, 2015
Sep. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Apr. 17, 2015
Business Acquisition [Line Items]          
Cash paid to, or on behalf of, ITS and its equity holders $ 10,448        
Business Combination, Contingent Consideration, Liability, Current         $ 8,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred $ 17,200        
Goodwill (Note 3)   $ 4,000 $ 2,000 $ 2,000 $ 6,755