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GOODWILL AND INTANGIBLE ASSETS - Intangible Assets Other Than Goodwill (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2017
Dec. 31, 2017
Amortizable intangible assets:    
Gross Carrying Amount $ 188,512 $ 171,163
Accumulated Amortization (68,841) (72,502)
Net carrying amount 119,671 98,661
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2018   19,821
2019   17,299
2020   15,736
2021   12,431
2022   12,128
Thereafter   21,246
Net carrying amount 119,671 98,661
Customer relationships    
Amortizable intangible assets:    
Gross Carrying Amount 165,725 148,114
Accumulated Amortization (54,676) (53,801)
Net carrying amount 111,049 94,313
Impairment of intangible assets, finite-lived 28,900  
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Net carrying amount 111,049 94,313
Trade names/trademarks (3)    
Amortizable intangible assets:    
Gross Carrying Amount 4,378 4,149
Accumulated Amortization (3,385) (3,736)
Net carrying amount 993 413
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Net carrying amount 993 413
Non-compete agreements    
Amortizable intangible assets:    
Gross Carrying Amount 1,400 1,400
Accumulated Amortization (1,097) (1,377)
Net carrying amount 303 23
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Net carrying amount 303 23
Technologies    
Amortizable intangible assets:    
Gross Carrying Amount 17,009 17,500
Accumulated Amortization (9,683) (13,588)
Net carrying amount 7,326 3,912
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Net carrying amount $ 7,326 $ 3,912