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FAIR VALUE MEASUREMENT - Recurring basis (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2017
GBP (£)
item
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 28, 2015
CAD ($)
Sep. 28, 2015
USD ($)
Commodity hedge          
Fair value measurements of the entity's assets or liabilities that are measured at fair value on a recurring basis          
Term of swap contract 2 years        
Derivative asset   $ 3,416,000 $ 4,230,000    
Interest rate swap | Not designated as hedging instruments          
Fair value measurements of the entity's assets or liabilities that are measured at fair value on a recurring basis          
Notional amount       $ 186.0 $ 133,900,000
Derivative liabilities   0 3,863,000    
Interest rate swap | Designated as hedging instruments | Cash flow hedge          
Fair value measurements of the entity's assets or liabilities that are measured at fair value on a recurring basis          
Number of financial institutions | item 2        
Notional amount £ 78,400,000.00000 96,800,000      
Derivative notional amount   399,000,000.00000      
Recurring basis | Significant Other Observable Inputs (Level 2)          
Fair value measurements of the entity's assets or liabilities that are measured at fair value on a recurring basis          
Total assets   27,111,000 27,716,000    
Total liabilities   6,480,000 9,625,000    
Recurring basis | Significant Other Observable Inputs (Level 2) | Foreign exchange forward contracts          
Fair value measurements of the entity's assets or liabilities that are measured at fair value on a recurring basis          
Total assets   12,316,000 10,632,000    
Total liabilities   5,121,000 3,496,000    
Recurring basis | Significant Other Observable Inputs (Level 2) | Commodity hedge          
Fair value measurements of the entity's assets or liabilities that are measured at fair value on a recurring basis          
Total assets   3,416,000 4,230,000    
Recurring basis | Significant Other Observable Inputs (Level 2) | Interest rate swap          
Fair value measurements of the entity's assets or liabilities that are measured at fair value on a recurring basis          
Total assets   11,379,000 12,854,000    
Total liabilities   1,359,000 5,418,000    
Recurring basis | Significant Other Observable Inputs (Level 2) | Warrants          
Fair value measurements of the entity's assets or liabilities that are measured at fair value on a recurring basis          
Total liabilities     711,000    
Total Fair Value and Carrying Value on the Balance Sheets | Recurring basis          
Fair value measurements of the entity's assets or liabilities that are measured at fair value on a recurring basis          
Total assets   27,111,000 27,716,000    
Total liabilities   6,480,000 9,625,000    
Total Fair Value and Carrying Value on the Balance Sheets | Recurring basis | Foreign exchange forward contracts          
Fair value measurements of the entity's assets or liabilities that are measured at fair value on a recurring basis          
Total assets   12,316,000 10,632,000    
Total liabilities   5,121,000 3,496,000    
Total Fair Value and Carrying Value on the Balance Sheets | Recurring basis | Commodity hedge          
Fair value measurements of the entity's assets or liabilities that are measured at fair value on a recurring basis          
Total assets   3,416,000 4,230,000    
Total Fair Value and Carrying Value on the Balance Sheets | Recurring basis | Interest rate swap          
Fair value measurements of the entity's assets or liabilities that are measured at fair value on a recurring basis          
Total assets   11,379,000 12,854,000    
Total liabilities   $ 1,359,000 5,418,000    
Total Fair Value and Carrying Value on the Balance Sheets | Recurring basis | Warrants          
Fair value measurements of the entity's assets or liabilities that are measured at fair value on a recurring basis          
Total liabilities     $ 711,000