Derivative Instruments (Tables)

6 Months Ended

Jun. 30, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Summary of aggregate notional amount and estimated fair value of derivative instruments

The following table presents the fair values of the Company's derivative instruments for the following periods:

	As of June 30, 2015					As of December 31, 2014
In thousands	Notional		Fair Value			Notional		Fair Value
Undesignated hedges:
Providência Contracts	$	120,444	$	1,848		$	140,623	$	3,962
Providência Instruments	15,585		(640		)	20,179		(560		)
Dounor Contract	—		—			—		—
Total	$	136,029	$	1,208		$	160,802	$	3,402

Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location

The following table represents the amount of (gain) or loss associated with derivative instruments in the Consolidated Statements of Comprehensive Income (Loss):

In thousands	Three Months Ended June 30, 2015		Three Months Ended June 28, 2014			Six Months Ended June 30, 2015			Six Months Ended June 28, 2014
Undesignated hedges:
Providência Contracts	$	363	$	(11,673	)	2,288			(22,429		)
Providência Instruments	133		1			(107		)	1
Dounor Contract	53		—			212			—
Total	$	549	$	(11,672	)	$	2,393		$	(22,428	)