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GOODWILL AND OTHER INTANGIBLES - Narrative (Details) | 12 Months Ended
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Dec. 31, 2016 USD ($) acquisition | Dec. 31, 2015 USD ($) acquisition | Dec. 31, 2014 USD ($) | Dec. 31, 2011 acquisition
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Number of significant acquisitions completed (acquisition) | acquisition | 3 | 2 |  | 2
Goodwill, impairment | $ 0 | $ 0 |  |
Amortization of intangible assets | 2,927,000 | 3,563,000 | $ 4,812,000 |
Finite-lived intangible assets, amortization expense, 2017 | 3,900,000 |  |  |
Finite-lived intangible assets, amortization expense, 2018 | 3,600,000 |  |  |
Finite-lived intangible assets, amortization expense, 2019 | 3,300,000 |  |  |
Finite-lived intangible assets, amortization expense, 2020 | 3,000,000 |  |  |
Finite-lived intangible assets, amortization expense, 2021 | 1,200,000 |  |  |
Finite-lived intangible assets, amortization expense, thereafter | 4,500,000 |  |  |
Impairment of intangible assets, finite-lived | $ 0 | $ 0 | $ 0 |
Minimum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived intangible asset, useful life | 4 years |  |  |
Maximum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived intangible asset, useful life | 15 years |  |  |

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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 3: 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=66902209&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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