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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Purchased and Internally Developed Software (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Less accumulated amortization | $ (156,246) | $ (122,283)
Net | 98,347 | 141,110
Software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Less accumulated amortization | (66,638) | (54,194)
Net | 34,675 | 26,776
Purchased software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Software | 32,460 | 25,805
Internally developed software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Software | $ 68,853 | $ 55,165

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