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CUSTOMER CONTRACTS AND OTHER INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Finite-lived intangible assets |  |  |
Finite-lived intangible assets, net | $ 152,869 | $ 117,466 |
Other intangible assets |  |  |
Other intangible assets, net | 61,548 | 44,310 |
Finite and infinite lived intangible assets, net | 214,417 | 161,776 |
Non-amortizable, indefinite lived intangible assets | 32,200 | 29,700 |
Total amortization expense | 29,200 | 26,200 | $ 25,200
Customer contracts |  |  |
Finite-lived intangible assets |  |  |
Finite-lived intangible assets, gross | 290,628 | 251,194 |
Less: Accumulated amortization | (137,759) | (133,728) |
Finite-lived intangible assets, net | $ 152,869 | 117,466 |
Patents |  |  |
Schedule of Finite and Indefinite Lived Intangible Assets by Major Class [Line Items] |  |  |
Useful life of intangible assets | 15 years |  |
Intangible assets excluding goodwill and customer contracts |  |  |
Finite-lived intangible assets |  |  |
Less: Accumulated amortization | $ (14,232) | (12,627) |
Other intangible assets |  |  |
Other intangible assets, net | 75,780 | 56,937 |
Finite and infinite lived intangible assets, net | 61,548 | 44,310 |
Trademarks and trade names |  |  |
Other intangible assets |  |  |
Finite and infinite lived intangible assets, net | 35,000 | 32,700 |
International | Customer contracts |  |  |
Finite-lived intangible assets |  |  |
Finite-lived intangible assets, net | 29,800 | 29,700 |
Other intangible assets |  |  |
Finite and infinite lived intangible assets, net | $ 3,500 | $ 3,800 |
Minimum | Customer contracts |  |  |
Schedule of Finite and Indefinite Lived Intangible Assets by Major Class [Line Items] |  |  |
Useful life of intangible assets | 7 years |  |
Minimum | Non-compete agreements |  |  |
Schedule of Finite and Indefinite Lived Intangible Assets by Major Class [Line Items] |  |  |
Useful life of intangible assets | 3 years |  |
Maximum | Customer contracts |  |  |
Schedule of Finite and Indefinite Lived Intangible Assets by Major Class [Line Items] |  |  |
Useful life of intangible assets | 20 years |  |
Maximum | Non-compete agreements |  |  |
Schedule of Finite and Indefinite Lived Intangible Assets by Major Class [Line Items] |  |  |
Useful life of intangible assets | 20 years |  |

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- Definition Finite and Indefinite Lived Intangible Assets (Excluding Goodwill) and Customer Contracts, Net + References No definition available. + Details
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- Definition Finite and Indefinite Lived Intangible Assets, Net [Abstract] + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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