Derivatives (Tables)

6 Months Ended

Jun. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Summary of Fair Value of Hedges

The fair value of our aluminum hedges are classified in the accompanying consolidated balance sheets as follows (in thousands):

	Derivative Assets				Derivative Liabilities
	June 30, 2018				June 30, 2018
Derivatives designated as hedging instruments under Subtopic 815-20:	Balance Sheet Location		Fair Value		Balance Sheet Location		Fair Value
Derivative instruments:
Aluminum forward contracts		Other current assets	$	128		Accrued liabilities	$	(352	)
Aluminum forward contracts				—		Other liabilities		(292	)
Total derivative instruments		Total derivative assets	$	128		Total derivative liabilities	$	(644	)

Gains (Losses) on Derivative Financial Instruments

The following represents the gains (losses) on derivative financial instruments, and their classifications within the accompanying condensed consolidated financial statements (in thousands):

	Derivatives in Cash Flow Hedging Relationships
	Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)					Location of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
	Three Months Ended						Three Months Ended
	June 30,			July 1,			June 30,		July 1,
	2018			2017			2018		2017
Aluminum contracts	$	(390	)	$	—	Cost of sales	$	43	$	—

	Location of Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)		Amount of Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)
			Three Months Ended
			June 30,		July 1,
			2018		2017
Aluminum contracts		Cost of sales	$	—	$	—

	Derivatives in Cash Flow Hedging Relationships
	Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)					Location of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
	Six Months Ended						Six Months Ended
	June 30,			July 1,			June 30,		July 1,
	2018			2017			2018		2017
Aluminum contracts	$	(473	)	$	—	Cost of sales	$	43	$	—

	Location of Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)		Amount of Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)
			Six Months Ended
			June 30,		July 1,
			2018		2017
Aluminum contracts		Cost of sales	$	—	$	—