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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Purchased and Internally Developed Software (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Less accumulated amortization | $ (87,486) | $ (61,405)
Net | 157,050 | 109,767
Software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Less accumulated amortization | (47,957) | (42,930)
Net | 27,303 | 21,435
Software | Purchased software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Software | 23,753 | 23,569
Software | Internally developed software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Software | $ 51,507 | $ 40,796

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