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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

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