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INTANGIBLE ASSETS AND GOODWILL (Intangible assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period $ 354,221 $ 354,221
Balance, end of period 401,605 354,221
Carrying amount 354,221 354,221
Gross carrying amount    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period 490,457 451,955
Additions 2,852 5,282
Additions through business acquisitions 70,358 33,984
Balance, end of period 561,810 490,457
Carrying amount 490,457 451,955
Disposals, intangible assets other than goodwill 1,857 764
Accumulated amortization    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period (136,236) (115,202)
Amortization 25,594 21,289
Balance, end of period (160,205) (136,236)
Carrying amount (136,236) (115,202)
Disposals, intangible assets other than goodwill (1,625) (255)
Customer contracts and customer relationships    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period   143,346
Balance, end of period 149,017  
Carrying amount 149,017 143,346
Customer contracts and customer relationships | Gross carrying amount    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period 205,531 191,831
Additions 0 0
Additions through business acquisitions 18,958 13,700
Balance, end of period 224,489 205,531
Carrying amount 205,531 191,831
Disposals, intangible assets other than goodwill 0 0
Customer contracts and customer relationships | Accumulated amortization    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period (62,185) (50,740)
Amortization 13,287 11,445
Balance, end of period (75,472) (62,185)
Carrying amount (62,185) (50,740)
Disposals, intangible assets other than goodwill 0 0
License agreements    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period   16,912
Balance, end of period 10,464  
Carrying amount 10,464 16,912
License agreements | Gross carrying amount    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period 59,498 58,300
Additions 0 1,198
Additions through business acquisitions 0 0
Balance, end of period 59,498 59,498
Carrying amount 59,498 58,300
Disposals, intangible assets other than goodwill 0 0
License agreements | Accumulated amortization    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period (42,586) (36,140)
Amortization 6,448 6,446
Balance, end of period (49,034) (42,586)
Carrying amount (42,586) (36,140)
Disposals, intangible assets other than goodwill 0 0
Computer software    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period   19,248
Balance, end of period 17,060  
Carrying amount 17,060 19,248
Computer software | Gross carrying amount    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period 48,776 44,972
Additions 2,852 4,084
Additions through business acquisitions 0 484
Balance, end of period 49,771 48,776
Carrying amount 48,776 44,972
Disposals, intangible assets other than goodwill 1,857 764
Computer software | Accumulated amortization    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period (29,528) (26,600)
Amortization 4,808 3,183
Balance, end of period (32,711) (29,528)
Carrying amount (29,528) (26,600)
Disposals, intangible assets other than goodwill (1,625) (255)
Non-compete agreements    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period   68
Balance, end of period 0  
Carrying amount 0 68
Non-compete agreements | Gross carrying amount    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period 1,880 1,880
Additions 0 0
Additions through business acquisitions 0 0
Balance, end of period 1,880 1,880
Carrying amount 1,880 1,880
Disposals, intangible assets other than goodwill 0 0
Non-compete agreements | Accumulated amortization    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period (1,812) (1,722)
Amortization 68 90
Balance, end of period (1,880) (1,812)
Carrying amount (1,812) (1,722)
Disposals, intangible assets other than goodwill 0 0
Trademarks    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period   174,647
Balance, end of period 225,064  
Carrying amount 225,064 174,647
Trademarks | Gross carrying amount    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period 174,772 154,972
Additions 0 0
Additions through business acquisitions 51,400 19,800
Balance, end of period 226,172 174,772
Carrying amount 174,772 154,972
Disposals, intangible assets other than goodwill 0 0
Trademarks | Accumulated amortization    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period (125) 0
Amortization 983 125
Balance, end of period (1,108) (125)
Carrying amount (125) 0
Disposals, intangible assets other than goodwill $ 0 $ 0