Annual report pursuant to Section 13 and 15(d)

SEGMENT INFORMATION, MAJOR CUSTOMERS AND GEOGRAPHICAL DATA Narrative (Details)

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SEGMENT INFORMATION, MAJOR CUSTOMERS AND GEOGRAPHICAL DATA Narrative (Details) - employee
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
BRAZIL      
Revenue, Major Customer [Line Items]      
Number of employees 268    
Sales | Foreign Operations      
Revenue, Major Customer [Line Items]      
Percentage of operating revenues 21.00% 15.00% 18.00%
Sales | Anadarko Petroleum Corporation      
Revenue, Major Customer [Line Items]      
Percentage of operating revenues 27.00% 26.00% 19.00%
Sales | U.S. Government      
Revenue, Major Customer [Line Items]      
Percentage of operating revenues 13.00% 10.00% 11.00%
Unionized Employees Concentration Risk [Member] | Number of Employees, Total [Member]      
Revenue, Major Customer [Line Items]      
Percentage of operating revenues 29.00%