Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2020

Fair Value Disclosures [Abstract]

Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

The following fair value hierarchy table presents information about the Company's financial assets and liabilities measured at fair value on a recurring basis:

(In thousands)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance at December 31, 2020
Assets
Deferred compensation plan	$	22,510	$	—	$	—	$	22,510
Derivative instruments	—		2,647		23,707		26,354
Total assets	$	22,510	$	2,647	$	23,707	$	48,864
Liabilities
Deferred compensation plan	$	30,581	$	—	$	—	$	30,581
Derivative instruments	—		—		145		145
Total liabilities	$	30,581	$	—	$	145	$	30,726

(In thousands)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance at December 31, 2019
Assets
Deferred compensation plan	$	18,381	$	—	$	—	$	18,381
Derivative instruments	—		44		3		47
Total assets	$	18,381	$	44	$	3	$	18,428
Liabilities
Deferred compensation plan	$	27,012	$	—	$	—	$	27,012
Derivative instruments	—		—		25		25
Total liabilities	$	27,012	$	—	$	25	$	27,037

Reconciliation of Changes in Fair Value of Financial Assets and Liabilities Classified as Level 3

The following table sets forth a reconciliation of changes in the fair value of financial assets and liabilities classified as Level 3 in the fair value hierarchy:

	Year Ended December 31,
(In thousands)	2020		2019		2018
Balance at beginning of period	$	(22)	$	21,976	$	(28,398)
Total gain (loss) included in earnings	40,563		24,794		31,184
Settlement (gain) loss	(16,979)		(46,792)		19,190
Transfers in and/or out of Level 3	—		—		—
Balance at end of period	$	23,562	$	(22)	$	21,976
Change in unrealized gains (losses) relating to assets and liabilities still held at the end of the period	$	23,562	$	(22)	$	19,732

Carrying Amount and Fair Value of Debt

The carrying amount and fair value of debt is as follows:

	December 31, 2020				December 31, 2019
(In thousands)	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Long-term debt	$	1,133,924	$	1,213,811	$	1,220,025	$	1,260,259
Current maturities	(188,000)		(189,332)		(87,000)		(88,704)
Long-term debt, excluding current maturities	$	945,924	$	1,024,479	$	1,133,025	$	1,171,555