Derivatives Instruments Fair Value (Details) (Foreign Currency Hedge, Accounts payable and accrued liabilities, Foreign Exchange Forward, USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Summary of aggregate notional amount and estimated fair value of derivative instruments
Notional	$ 132,294	$ 160,802
Fair Value	1,594	3,402
Providência Contracts | Undesignated hedges:
Summary of aggregate notional amount and estimated fair value of derivative instruments
Notional	56,542	140,623
Fair Value	2,159	3,962
Providência Instruments | Undesignated hedges:
Summary of aggregate notional amount and estimated fair value of derivative instruments
Notional	16,715	20,179
Fair Value	(618)	(560)
Hygiene Line | Undesignated hedges:
Summary of aggregate notional amount and estimated fair value of derivative instruments
Notional	59,037	0
Fair Value	$ 53	$ 0