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RESTRUCTURING (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
RESTRUCTURING  
Restructuring Charges $ 631
CNG and Abilene Heavy Fabrications  
RESTRUCTURING  
Annual cost savings 575
Restructuring Charges 668
CNG and Abilene Heavy Fabrications | Selling, general and administrative  
RESTRUCTURING  
Restructuring Charges 37
CNG and Abilene Heavy Fabrications | Facility costs | Cost of sales  
RESTRUCTURING  
Restructuring Charges 249
CNG and Abilene Heavy Fabrications | Moving and remediation | Cost of sales  
RESTRUCTURING  
Restructuring Charges 33
CNG and Abilene Heavy Fabrications | Salary and severance | Cost of sales  
RESTRUCTURING  
Restructuring Charges 17
CNG and Abilene Heavy Fabrications | Salary and severance | Selling, general and administrative  
RESTRUCTURING  
Restructuring Charges 37
CNG and Abilene Heavy Fabrications | Depreciation | Cost of sales  
RESTRUCTURING  
Restructuring Charges 332
Towers and Heavy Fabrications | Cost of sales  
RESTRUCTURING  
Restructuring Charges $ 631