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
 3 Months Ended
Apr. 22, 2013
Mar. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Apr. 17, 2015
Business Acquisition [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents         $ 17
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      
Business Combination, Acquired Receivables, Fair Value         1,112
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Rig and Materials Supplies         883
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets         2,012
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment         477
Goodwill (Note 3)   2,000 $ 4,000 $ 2,000 6,755
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles   $ 13,470      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets         22,667
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable         863
Business Combination, Contingent Consideration, Liability, Current         863
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent         4,601
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities         5,464
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net         $ 17,203