Annual report pursuant to Section 13 and 15(d)

Acquisitions Acquisition of ITS (Details)

v3.3.1.900
Acquisitions Acquisition of ITS (Details) - ITS [Member] - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Apr. 22, 2013
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]        
Payments to Acquire Businesses, Gross $ 101,000      
Business Acquisition, Cash Deposited in Escrow $ 24,000      
Business Acquisition, Escrow Funds Released   $ 20,700 $ 20,700  
Business Acquisition, Escrow Funds Received   $ 3,300 $ 500 $ 2,800