ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Schedule of Components) (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 1,496,752	$ 1,361,740	$ 1,361,740
Other comprehensive income/(loss) before reclassifications	(20,341)		(32,431)
Amounts reclassified from accumulated other comprehensive income	(1,022)		(1,510)
Net other comprehensive income/(loss)	19,319		30,921
Recapitalization of New Zealand JV			0
Ending balance	1,668,110		1,496,752
Foreign currency translation gains/ (losses)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	8,559	(2,450)	(2,450)
Other comprehensive income/(loss) before reclassifications	(19,201)		(7,387)
Amounts reclassified from accumulated other comprehensive income	0		0
Net other comprehensive income/(loss)	19,201		7,387
Recapitalization of New Zealand JV			3,622
Ending balance	27,760		8,559
Net investment hedges of New Zealand JV
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	1,665	6,271	6,271
Other comprehensive income/(loss) before reclassifications	0		0
Amounts reclassified from accumulated other comprehensive income	0		(4,606)
Net other comprehensive income/(loss)	0		(4,606)
Recapitalization of New Zealand JV			0
Ending balance	1,665		1,665
Cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	10,831	(11,592)	(11,592)
Other comprehensive income/(loss) before reclassifications	(1,140)		(22,024)
Amounts reclassified from accumulated other comprehensive income	(1,255)	428	583
Net other comprehensive income/(loss)	(115)		22,607
Recapitalization of New Zealand JV			(184)
Ending balance	10,716		10,831
Employee benefit plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(20,199)	(25,732)	(25,732)
Other comprehensive income/(loss) before reclassifications	0		(3,020)
Amounts reclassified from accumulated other comprehensive income	233		2,513
Net other comprehensive income/(loss)	233		5,533
Recapitalization of New Zealand JV			0
Ending balance	(19,966)		(20,199)
Annual computation of pension liabilities gain (loss)			2,400
Curtailment gain			5,400
Accumulated Other Comprehensive Income/(Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	856	$ (33,503)	(33,503)
Recapitalization of New Zealand JV			3,438
Ending balance	20,175		$ 856
Interest rate swaps | Cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Other comprehensive income/(loss) before reclassifications	$ 2,400