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ACQUISITIONS - SCHEDULE OF PURCHASE PRICE ALLOCATION (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Assets Acquired |  |  |
Goodwill | $ 1,771,877 | $ 1,730,950 | $ 1,681,662
Total assets acquired | 0 | 76,980 | 192,099
Liabilities Assumed |  |  |
Total liabilities assumed | $ 0 | $ 25,058 | $ 39,836

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