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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2020
Stockholders Equity Note [Abstract]  
Schedule of Changes in Accumulated Other Comprehensive Loss

Accumulated other comprehensive loss - Changes in accumulated other comprehensive loss attributable to NL stockholders, including amounts resulting from our investment in Kronos Worldwide (see Note 6), are presented in the table below.

 

Years ended December 31,

 

 

2018

 

 

2019

 

 

2020

 

 

(In thousands)

 

Accumulated other comprehensive loss, net of tax:

 

 

 

 

 

 

 

 

 

 

 

Currency translation:

 

 

 

 

 

 

 

 

 

 

 

Balance at beginning of year

$

(164,467

)

 

$

(172,434

)

 

$

(172,843

)

Other comprehensive income (loss)

 

(7,967

)

 

 

(409

)

 

 

3,268

 

Balance at end of year

$

(172,434

)

 

$

(172,843

)

 

$

(169,575

)

 

 

 

 

 

 

 

 

 

 

 

 

Defined benefit pension plans:

 

 

 

 

 

 

 

 

 

 

 

Balance at beginning of year

$

(72,951

)

 

$

(75,286

)

 

$

(78,257

)

Other comprehensive income (loss):

 

 

 

 

 

 

 

 

 

 

 

Amortization of prior service cost and net losses

  included in net periodic pension cost

 

(2,335

)

 

 

3,539

 

 

 

4,330

 

Net actuarial loss arising during the year

 

-

 

 

 

(6,510

)

 

 

(6,777

)

Balance at end of year

$

(75,286

)

 

$

(78,257

)

 

$

(80,704

)

 

 

 

 

 

 

 

 

 

 

 

 

Marketable securities:

 

 

 

 

 

 

 

 

 

 

 

Balance at beginning of year

$

46,069

 

 

$

-

 

 

$

-

 

Change in accounting principle

 

(46,069

)

 

 

-

 

 

 

-

 

Balance at beginning of year, as adjusted

 

-

 

 

 

-

 

 

 

-

 

Other comprehensive income:

 

 

 

 

 

 

 

 

 

 

 

Unrealized gain arising during the year

 

-

 

 

 

-

 

 

 

-

 

Balance at end of year

$

-

 

 

$

-

 

 

$

-

 

 

 

 

 

 

 

 

 

 

 

 

 

Other postretirement benefit plans:

 

 

 

 

 

 

 

 

 

 

 

Balance at beginning of year

$

(388

)

 

$

(550

)

 

$

(590

)

Other comprehensive loss

 

(162

)

 

 

(40

)

 

 

(320

)

Balance at end of year

$

(550

)

 

$

(590

)

 

$

(910

)

 

 

 

 

 

 

 

 

 

 

 

 

Total accumulated other comprehensive loss, net of tax:

 

 

 

 

 

 

 

 

 

 

 

Balance at beginning of year

$

(191,737

)

 

$

(248,270

)

 

$

(251,690

)

Change in accounting principle

 

(46,069

)

 

 

-

 

 

 

-

 

Balance at beginning of year, as adjusted

 

(237,806

)

 

 

(248,270

)

 

 

(251,690

)

Other comprehensive income (loss)

 

(10,464

)

 

 

(3,420

)

 

 

501

 

Balance at end of year

$

(248,270

)

 

$

(251,690

)

 

$

(251,189

)