Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2019

Fair Value of Financial Instruments (Thousands of Dollars) [Abstract]

Fair Value Hierarchy

	Fair Value Measurements Using:
			Quoted
			Prices in
			Active
			Markets		Significant
			for		Other		Significant
			Identical		Observable		Unobservable
	Fair		Assets		Inputs		Inputs
	Value		(Level 1)		(Level 2)		(Level 3)
March 31, 2019
Assets:
Available-for-sale securities	$	975		975		-		-
Derivatives		32,296		-		32,296		-
Total assets	$	33,271		975		32,296		-
Liabilities:
Derivatives	$	45		-		45		-
Option agreement		23,144		-		-		23,144
Total liabilities	$	23,189		-		45		23,144
April 1, 2018
Assets:
Available-for-sale securities	$	2,941		2,941		-		-
Derivatives		2,960		-		2,960		-
Total assets	$	5,901		2,941		2,960		-
Liabilities:
Derivatives	$	39,428		-		39,428		-
Option agreement		23,665		-		-		23,665
Total liabilities	$	63,093		-		39,428		23,665
December 30, 2018
Assets:
Available-for-sale securities	$	914		914		-		-
Derivatives		26,076		-		26,076		-
Total assets	$	26,990		914		26,076		-
Liabilities:
Derivatives	$	1,610		-		1,610		-
Option agreement		23,440		-		-		23,440
Total Liabilities	$	25,050		-		1,610		23,440

Reconciliation of Level 3 Fair Value

	2019		2018
Balance at beginning of year	$	(23,440)		(23,980)
Gain from change in fair value		296		315
Balance at end of first quarter	$	(23,144)		(23,665)