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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Purchased and Internally Developed Software (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Less accumulated amortization | $ (122,283) | $ (87,486)
Net | 141,110 | 157,050
Software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Less accumulated amortization | (54,194) | (47,957)
Net | 26,776 | 27,303
Software | Purchased software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Software | 25,805 | 23,753
Software | Internally developed software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Software | $ 55,165 | $ 51,507

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- Definition Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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