Derivative Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2019

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 March 31, 2019 and December 31, 2018:

	March 31, 2019
	Other Current Assets		Other Non-current Assets		Accrued Liabilities		Other Non-current Liabilities
(Dollars in thousands)
Foreign exchange forward contracts designated as    hedging instruments	$	4,006	$	3,861	$	527	$	2,569
Foreign exchange forward contracts not designated    as hedging instruments		365		—		407		—
Aluminum forward contracts designated as hedging    instruments		230		—		186		—
Cross currency swap not designated as a hedging    instrument		8		—		—		—
Natural gas forward contracts designated as hedging    instruments		23		—		457		64
Interest rate swaps designated as hedging    instruments		—		—		510		2,297
Embedded derivative liability		—		—		—		2,508
Total derivative financial instruments	$	4,632	$	3,861	$	2,087	$	7,438

	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 a hedging    instrument		—		—		227		—
Natural gas forward contracts designated as hedging    instruments		275		—		355		—
Interest rate swaps designated as hedging    instruments		—		—		131		128
Embedded derivative liability		—		—		—		3,134
Total derivative financial instruments	$	3,207	$	1,011	$	2,506	$	9,464

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:

	March 31, 2019					December 31, 2018
	Notional U.S. Dollar Amount		Fair Value			Notional U.S. Dollar Amount		Fair Value
(Dollars in thousands)
Foreign exchange forward contracts designated as    hedging instruments	$	480,681	$	4,771		$	467,253	$	(3,251	)
Foreign exchange forward contracts not designated    as hedging instruments		58,251		(42	)		45,905		126
Aluminum forward contracts designated as hedging    instruments		17,295		44			10,810		(927	)
Cross currency swap not designated as a hedging    instrument		6,076		8			12,151		(227	)
Natural gas forward contracts designated as hedging    instruments		2,842		(498	)		2,165		(80	)
Interest rate swaps designated as hedging    instruments		290,000		(2,807	)		90,000		(259	)
Total derivative financial instruments	$	855,145	$	1,476		$	628,284	$	(4,618	)

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 March 31, 2019 and 2018, the amounts reclassified from AOCI into earnings and the amounts recognized directly into earnings for the three months ended March 31, 2019 and 2018:

Three months ended March 31, 2019	Amount of Gain or (Loss) Recognized in AOCI on Derivatives,          net of tax		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	$	4,926	$	836	$	1,684
Total	$	4,926	$	836	$	1,684

Three months ended March 31, 2018	Amount of Gain or (Loss) Recognized in AOCI on Derivatives,           net of tax		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	$	13,910	$	585	$	(744	)
Total	$	13,910	$	585	$	(744	)