Derivative Instruments (Tables)

3 Months Ended

Mar. 31, 2020

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value

The fair value of all derivatives is recorded as assets or liabilities on a gross basis in our Condensed Consolidated Balance Sheets. As of March 31, 2020 and December 31, 2019, the fair value of our derivatives and their respective balance sheet locations are presented in the following tables:

	Asset Derivatives			Liability Derivatives
	Location	Fair  Value		Location	Fair  Value
As of March 31, 2020	(Dollars in thousands)
Derivatives designated as cash flow hedges:
Commodity derivative contracts	Prepaid and other current assets	$	—	Other accrued liabilities	$	18,002
	Other long-term assets	—		Other long-term obligations	15,739
Interest rate swap contracts	Prepaid and other current assets	—		Other accrued liabilities	5,869
	Other long-term assets	—		Other long-term obligations	7,922
Total fair value		$	—		$	47,532
As of December 31, 2019
Derivatives designated as cash flow hedges:
Commodity derivative contracts	Prepaid and other current assets	$	104	Other accrued liabilities	$	1,872
	Other long-term assets	369		Other long-term obligations	2,255
Interest rate swap contracts	Prepaid and other current assets	253		Other accrued liabilities	—
	Other long-term assets	2,684		Other long-term obligations	72
Total fair value		$	3,410		$	4,199

	Asset Derivatives			Liability Derivatives
	Location	Fair  Value		Location	Fair  Value
As of March 31, 2020	(Dollars in thousands)
Derivatives not designated as hedges:
Foreign currency derivatives	Prepaid and other current assets	$	90	Other current liabilities	$	135
Commodity derivatives contracts	Prepaid and other current assets	—		Other accrued liabilities	450
		$	90		$	585
As of December 31, 2019
Derivatives not designated as hedges:
Foreign currency derivatives	Prepaid and other current assets	$	239	Other current liabilities	$	81
Commodity derivatives contracts	Prepaid and other current assets	376		Other accrued liabilities	—
		$	615		$	81

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

		Amount of (Gain)/Loss Recognized
	Location of (Gain)/Loss Recognized in the Consolidated Statement of Operations	For the Three Months Ended March 31,
		2020			2019
Derivatives designated as cash flow hedges:		(Dollars in thousands)
Commodity derivative contracts	Cost of sales	$	(2,809	)	$	(1,848	)
Interest rate swap	Interest expense	(206		)	—
Derivatives not designated as hedges:
Foreign currency derivatives	Cost of sales, Other (income) expense	$	(499	)	(677		)
Commodity derivative contracts	Cost of sales	(139		)	—