Derivative Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Summary of Fair Value of Derivatives by Balance Sheet Line Item

The following tables display the fair value of derivatives by balance sheet line item at December 31, 2018 and December 31, 2017:

	December 31, 2018
	Other Current Assets		Other Non-current Assets		Accrued Liabilities		Other Non-current Liabilities
(Dollars in thousands)
Foreign exchange forward contracts designated as hedging instruments	$	2,599		1,011		659		6,202
Foreign exchange forward contracts not designated as hedging instruments		333		—		207		—
Aluminum forward contracts designated as hedging instruments		—		—		927		—
Cross currency swap not designated as hedging instrument		—		—		227		—
Natural gas forward contracts designated as hedging instruments		275		—		355		—
Interest rate swap contracts designated as hedging instruments		—		—		131		128
Embedded derivative liability		—		—		—		3,134
Total derivative financial instruments	$	3,207		1,011		2,506		9,464

	December 31, 2017
	Other Current Assets		Other Non-current Assets		Accrued Liabilities		Other Non-current Liabilities
(Dollars in thousands)
Foreign exchange forward contracts and collars designated as hedging instruments	$	3,065		723		4,922		8,405
Foreign exchange forward contracts not designated as hedging instruments		721		—		206		—
Aluminum forward contracts not designated as hedging instruments		1,833		—		—		—
Cross currency swap not designated as hedging instrument		—		—		1,467		1,106
Embedded derivative liability		—		—		—		4,685
Total derivative financial instruments	$	5,619		723		6,595		14,196

Summary of Notional Amount and Estimated Fair Value of Derivative Financial Instruments

The following table summarizes the notional amount and estimated fair value of our derivative financial instruments:

	December 31, 2018					December 31, 2017
	Notional U.S. Dollar Amount		Fair Value			Notional U.S. Dollar Amount		Fair Value
(Dollars in thousands)
Foreign currency forward contracts and collars designated as hedging instruments	$	467,253	$	(3,251	)	$	397,744	$	(9,539	)
Foreign exchange forward contracts not designated as hedging instruments		45,905		126			23,305		515
Aluminum forward contracts not designated as hedges		10,810		(927	)		15,564		1,833
Cross currency swap not designated as hedging instrument		12,151		(227	)		36,454		(2,573	)
Natural gas forward contracts designated as hedging instrument		2,165		(80	)		—		—
Interest rate swap contracts designated as hedging instrument		90,000		(259	)		—		—
Total derivative financial instruments	$	628,284	$	(4,618	)	$	473,067	$	(9,764	)

Summary of Gain or Loss Recognized in AOCI (Loss)

The following tables summarize the gain or loss recognized in accumulated other comprehensive income (loss) (“AOCI”) as of December 31, 2018, 2017 and 2016 the amounts reclassified from AOCI into earnings and the amounts recognized directly into earnings for the years ended December 31, 2018, 2017 and 2016:

Year ended December 31, 2018	Amount of Gain or (Loss) Recognized in AOCI on Derivatives			Amount of Pre-tax Gain or (Loss) Reclassified from AOCI into  Income			Amount of Pre-tax Gain or (Loss) Recognized in Income on Derivatives
(Dollars in thousands)
Derivative Contracts	$	5,293		$	728		$	(406	)
Total	$	5,293		$	728		$	(406	)
Year ended December 31, 2017	Amount of Gain or (Loss) Recognized in AOCI on Derivatives (Effective Portion)			Amount of Pre-tax Gain or (Loss) Reclassified from AOCI into Income (Effective Portion)			Amount of Pre-tax Gain or (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)
(Dollars in thousands)
Derivative Contracts	$	7,603		$	(4,539	)	$	(538	)
Total	$	7,603		$	(4,539	)	$	(538	)
Year ended December 31, 2016	Amount of Gain or (Loss) Recognized in AOCI on Derivatives (Effective Portion)			Amount of Pre-tax Gain or (Loss) Reclassified from AOCI into Income (Effective Portion)			Amount of Pre-tax Gain or (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)
(Dollars in thousands)
Derivative Contracts	$	(6,812	)	$	(13,597	)	$	(156	)
Total	$	(6,812	)	$	(13,597	)	$	(156	)