ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accumulated other comprehensive income activity
Balance at the beginning of the period	$ 1,173,950
Balance at the end of the period	1,240,338
Foreign Currency
Accumulated other comprehensive income activity
Balance at the beginning of the period	(259,888)	$ (206,725)
Other comprehensive income (loss) before reclassifications	23,184	65,171
Net current-period other comprehensive income (loss)	23,184	65,171
Balance at the end of the period	(236,704)	(141,554)
Defined Benefit Pension Plans
Accumulated other comprehensive income activity
Balance at the beginning of the period	(59,775)	(55,550)
Amounts reclassified from accumulated other comprehensive income	879	833
Net current-period other comprehensive income (loss)	879	833
Balance at the end of the period	(58,896)	(54,717)
Other
Accumulated other comprehensive income activity
Balance at the beginning of the period	(46)	(72)
Amounts reclassified from accumulated other comprehensive income	7	7
Net current-period other comprehensive income (loss)	7	7
Balance at the end of the period	(39)	(65)
Accumulated Other Comprehensive Income/(Loss)
Accumulated other comprehensive income activity
Balance at the beginning of the period	(319,709)	(262,347)
Other comprehensive income (loss) before reclassifications	23,184	65,171
Amounts reclassified from accumulated other comprehensive income	886	840
Net current-period other comprehensive income (loss)	24,070	66,011
Balance at the end of the period	$ (295,639)	$ (196,336)