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GOODWILL AND OTHER INTANGIBLE ASSETS, Goodwill (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2015
USD ($)
Goodwill [Line Items]  
Goodwill, Beginning Balance $ 27,990
Effect of change in foreign currency exchange rates 0
Acquisition of business 1,659
Goodwill, Ending Balance 29,649
Schuff International, Inc [Member]  
Goodwill [Line Items]  
Goodwill, Beginning Balance 24,612
Effect of change in foreign currency exchange rates 0
Acquisition of business (122)
Goodwill, Ending Balance 24,490
International Carrier Services [Member]  
Goodwill [Line Items]  
Goodwill, Beginning Balance 3,378
Effect of change in foreign currency exchange rates 0
Acquisition of business 0
Goodwill, Ending Balance 3,378
Other [Member]  
Goodwill [Line Items]  
Goodwill, Beginning Balance 0
Effect of change in foreign currency exchange rates 0
Acquisition of business 1,781
Goodwill, Ending Balance $ 1,781