SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Components of accumulated other comprehensive income (loss)
Balance at the beginning of the period	$ (267,218)
Current-period comprehensive income (loss)	(79,141)
Balance at the end of the period	(346,359)
Foreign Currency Translation Adjustments
Components of accumulated other comprehensive income (loss)
Balance at the beginning of the period	(191,928)
Current-period comprehensive income (loss)	(59,300)
Balance at the end of the period	(251,228)
Unrealized Loss on Cash Flow Hedge
Components of accumulated other comprehensive income (loss)
Balance at the beginning of the period	3,678
Current-period comprehensive income (loss)	4,300
Balance at the end of the period	7,978
Defined Benefit Pension Plan
Components of accumulated other comprehensive income (loss)
Balance at the beginning of the period	(78,968)
Current-period comprehensive income (loss)	(24,141)
Balance at the end of the period	$ (103,109)