DERIVATIVES AND FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Fair Value of Unwound Interest Rate Swap Agreements [Table Text Block]

The remaining fair value amounts associated with unwound interest rate swap agreements are presented in the table below. These amounts are amortized ratably over the remaining life of the related debt instrument into “Interest expense, net” on the consolidated statements of (loss) income.



		December 31,
Unwound Interest Rate Swap Agreements	Balance Sheet Location	2019		2018
		(Thousands of Dollars)
Fixed-to-floating	Current portion of long-term debt	$	2,755	$	—
Fixed-to-floating	Long-term debt, less current portion	$	2,568	$	10,475
Forward-starting	Accumulated other comprehensive income (loss)	$	3,045	$	(770	)

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

The fair values of our interest rate swap agreements included in our consolidated balance sheets were as follows:



Balance Sheet Location	December 31,
Balance Sheet Location	2019			2018
	(Thousands of Dollars)
Other long-term assets, net	$	—		$	627
Accrued liabilities	$	(19,169	)	$	—
Other long-term liabilities	$	—		$	(751	)

Derivative Instruments, Gain (Loss) [Table Text Block]

Our forward-starting interest rate swaps had the following impact on earnings:



	Year Ended December 31,
	2019			2018			2017
	(Thousands of Dollars)
(Loss) gain recognized in other comprehensive income (loss) on derivative	$	(19,045	)	$	17,912		$	(8,670	)
Loss reclassified from AOCI into interest expense, net	$	(3,814	)	$	(5,499	)	$	(6,624	)

Fair Value and Carrying Value of Debt [Table Text Block]

The estimated fair values and carrying amounts of the long-term debt, including the current portion and excluding finance leases, were as follows:



	December 31, 2019		December 31, 2018
	(Thousands of Dollars)
Fair value	$	3,442,001	$	3,056,704
Carrying amount	$	3,331,839	$	3,111,996