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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

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