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INTANGIBLE ASSETS Definite-lived Intangible Assets (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross $ 147,218,000 $ 123,226,000
Finite-Lived Intangible Assets, Accumulated Amortization 71,743,000 (53,491,000)
Finite-Lived Intangible Assets, Net 75,475,000 69,735,000
Indefinite-Lived Trademarks 1,305,000 1,305,000
Indefinite-Lived Intangible Assets (Excluding Goodwill) 1,305,000 1,305,000
Customer Relationships    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 59,794,000 47,892,000
Finite-Lived Intangible Assets, Accumulated Amortization (23,434,000) (17,519,000)
Unpatented Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 20,160,000 18,461,000
Finite-Lived Intangible Assets, Accumulated Amortization (5,013,000) (2,864,000)
Technology    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 6,542,000 2,499,000
Finite-Lived Intangible Assets, Accumulated Amortization (2,213,000) (1,532,000)
Trade names / trademarks    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 22,951,000 18,774,000
Finite-Lived Intangible Assets, Accumulated Amortization (5,097,000) (3,826,000)
Backlog    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 30,160,000 28,170,000
Finite-Lived Intangible Assets, Accumulated Amortization (28,695,000) (21,776,000)
Other Intangible Assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 7,611,000 7,430,000
Finite-Lived Intangible Assets, Accumulated Amortization $ (7,291,000) $ (5,974,000)