ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated other comprehensive income activity
Balance at the beginning of the period	$ 1,149,411
Balance at the end of the period	1,267,355
Foreign Currency
Accumulated other comprehensive income activity
Balance at the beginning of the period	(206,725)	$ (42,851)
Other comprehensive income (loss) before reclassifications	65,171	(139,246)
Net current-period other comprehensive income (loss)	65,171	(139,246)
Balance at the end of the period	(141,554)	(182,097)
Defined Benefit Pension Plans
Accumulated other comprehensive income activity
Balance at the beginning of the period	(55,550)	(67,097)
Amounts reclassified from accumulated other comprehensive income	833	1,169
Net current-period other comprehensive income (loss)	833	1,169
Balance at the end of the period	(54,717)	(65,928)
Other
Accumulated other comprehensive income activity
Balance at the beginning of the period	(72)	(97)
Amounts reclassified from accumulated other comprehensive income	7	6
Net current-period other comprehensive income (loss)	7	6
Balance at the end of the period	(65)	(91)
Accumulated Other Comprehensive Income/(Loss)
Accumulated other comprehensive income activity
Balance at the beginning of the period	(262,347)	(110,045)
Other comprehensive income (loss) before reclassifications	65,171	(139,246)
Amounts reclassified from accumulated other comprehensive income	840	1,175
Net current-period other comprehensive income (loss)	66,011	(138,071)
Balance at the end of the period	$ (196,336)	$ (248,116)