INCOME TAXES - Income Taxes (Payable) Receivable and Deferred Tax (Liabilities) Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Taxes (Payable) Receivable and Deferred Tax (Liabilities) Assets
Other current assets	$ 10,132	$ 33,239
Income taxes payable	(37,584)	(25,624)
Net income taxes payable	(28,796)	(2,234)
Other non-current assets	64,786	66,321
Deferred income taxes	(23,600)	(35,070)
Net deferred tax assets	41,186	31,251
Other current assets
Income Taxes (Payable) Receivable and Deferred Tax (Liabilities) Assets
Other current assets	10,132	33,239
Other non-current assets
Income Taxes (Payable) Receivable and Deferred Tax (Liabilities) Assets
Other non-current assets	11,401	1,949
Other non-current assets	64,786	66,321
Accrued expenses and other current liabilities
Income Taxes (Payable) Receivable and Deferred Tax (Liabilities) Assets
Accrued expenses and other current liabilities	(12,745)	(11,798)
Income taxes payable
Income Taxes (Payable) Receivable and Deferred Tax (Liabilities) Assets
Income taxes payable	(37,584)	(25,624)
Deferred income taxes
Income Taxes (Payable) Receivable and Deferred Tax (Liabilities) Assets
Deferred income taxes	$ (23,600)	$ (35,070)