Accumulated Other Comprehensive Income/(Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 856
Recapitalization of New Zealand JV		$ 0
Ending balance	13,417	856
Net periodic pension cost		2,400
Curtailment gain		5,400
Accumulated Other Comprehensive Income/(Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	856	(33,503)
Other comprehensive income/(loss) before reclassifications	14,064	32,431
Amounts reclassified from accumulated other comprehensive income	(1,503)	(1,510)
Net other comprehensive income/(loss)	12,561	30,921
Recapitalization of New Zealand JV		3,438
Ending balance	13,417	856
Foreign currency translation gains/(losses)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	8,559	(2,450)
Other comprehensive income/(loss) before reclassifications	7,416	7,387
Amounts reclassified from accumulated other comprehensive income	0	0
Net other comprehensive income/(loss)	7,416	7,387
Recapitalization of New Zealand JV		3,622
Ending balance	15,975	8,559
Net investment hedges of New Zealand JV
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	1,665	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)
Other comprehensive income/(loss) before reclassifications	7,321	22,024
Amounts reclassified from accumulated other comprehensive income	(1,968)	583
Net other comprehensive income/(loss)	5,353	22,607
Recapitalization of New Zealand JV		(184)
Ending balance	16,184	10,831
Cash flow hedges | Interest rate swaps
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Other comprehensive income/(loss) before reclassifications	4,200
Employee benefit plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(20,199)	(25,732)
Other comprehensive income/(loss) before reclassifications	(673)	3,020
Amounts reclassified from accumulated other comprehensive income	465	2,513
Net other comprehensive income/(loss)	(208)	5,533
Recapitalization of New Zealand JV		0
Ending balance	$ (20,407)	$ (20,199)