DERIVATIVE AND HEDGING INSTRUMENTS - Derivative and Financial Instruments Designated as Hedging Instruments (Details) $ in Thousands	Sep. 30, 2018 USD ($) instrument	Dec. 31, 2017 USD ($)
Assets:
Fair Value	$ 38,111	$ 25,895
Liabilities:
Fair Value	0	0
Designated as Hedging Instrument
Assets:
Fair Value	38,111	25,895
Liabilities:
Fair Value	$ 96,888	99,588
Designated as Hedging Instrument \| Interest rate swaps \| Cash flow \| Accounts receivable, prepaid expenses and other assets, net
Assets:
Count \| instrument	12
Fair Value	$ 36,688	25,221
Designated as Hedging Instrument \| Cross currency interest rate swaps \| Net investment \| Accounts receivable, prepaid expenses and other assets, net
Assets:
Count \| instrument	2
Fair Value	$ 1,423	674
Designated as Hedging Instrument \| CAD term loan \| Net investment \| Term loans, net
Liabilities:
Count \| instrument	1
Fair Value	$ 96,888	$ 99,588

The number of derivative instruments of a particular derivative asset or group of derivative assets held by the entity.

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The number of derivative instruments of a particular derivative liability or group of derivative liabilities held by the entity.

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