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GOODWILL AND OTHER INTANGIBLES - Narrative (Details)
 12 Months Ended
Dec. 31, 2016
USD ($)
acquisition
Dec. 31, 2015
USD ($)
acquisition
Dec. 31, 2014
USD ($)
Dec. 31, 2011
acquisition
Finite-Lived Intangible Assets [Line Items]        
Number of significant acquisitions completed (acquisition) | acquisition 3 2   2
Goodwill, impairment $ 0 $ 0    
Amortization of intangible assets 2,927,000 3,563,000 $ 4,812,000  
Finite-lived intangible assets, amortization expense, 2017 3,900,000      
Finite-lived intangible assets, amortization expense, 2018 3,600,000      
Finite-lived intangible assets, amortization expense, 2019 3,300,000      
Finite-lived intangible assets, amortization expense, 2020 3,000,000      
Finite-lived intangible assets, amortization expense, 2021 1,200,000      
Finite-lived intangible assets, amortization expense, thereafter 4,500,000      
Impairment of intangible assets, finite-lived $ 0 $ 0 $ 0  
Minimum        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible asset, useful life 4 years      
Maximum        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible asset, useful life 15 years