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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2021
Stockholders' Equity Note [Abstract]  
Dividends Declared [Table Text Block] Our board of directors declared and paid the following dividends during each of the respective quarters for the years ended December 31, 2021, 2020, and 2019:
Dividends Per ShareAmount Paid
2021(in thousands)
First Quarter (a)$0.10 $4,440 
Second Quarter (b)2.10 3,933 
Third Quarter (b)0.10 82,596 
Fourth Quarter (b)3.12 122,712 
Total$5.42 $213,681 
2020
First Quarter (a)$0.10 $4,645 
Second Quarter0.10 3,917 
Third Quarter (c)1.70 3,991 
Fourth Quarter (c)0.10 66,642 
Total$2.00 $79,195 
2019
First Quarter (a)$0.09 $4,053 
Second Quarter0.09 3,509 
Third Quarter 0.09 3,508 
Fourth Quarter (d)1.10 42,884 
Total$1.37 $53,954 
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(a)Includes payments of dividend equivalents on RSUs and PSUs which vested in first quarter of each year.

(b)During second quarter 2021, our board of directors declared a supplemental dividend of $2.00 per share on our common stock, which was paid in the third quarter 2021. During fourth quarter 2021, our board of directors declared and paid a supplemental dividend of $3.00 per share on our common stock.

(c)During third quarter 2020, our board of directors declared a supplemental dividend of $1.60 per share on our common stock, which was paid in fourth quarter 2020.
(d)During fourth quarter 2019, our board of directors declared and paid a supplemental dividend of $1.00 per share of our common stock.
Changes in Accumulated Other Comprehensive Loss [Table Text Block]
The following table details the changes in accumulated other comprehensive loss for the years ended December 31, 2021, 2020, and 2019:
Changes in Accumulated Other Comprehensive Loss
Year Ended December 31
202120202019
(thousands)
Beginning Balance, net of taxes
$(1,078)$(50,248)$(47,652)
Net actuarial gain (loss), before taxes61 6,832 (4,642)
Amortization of actuarial (gain) loss, before taxes (a)
(19)807 (175)
Effect of settlements, before taxes (a)
— 6,250 1,342 
Income taxes (b)(11)35,281 879 
Ending Balance, net of taxes
$(1,047)$(1,078)$(50,248)
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(a)    Represents amounts reclassified from accumulated other comprehensive loss. These amounts are included in the computation of net periodic pension cost. For additional information, see Note 11, Retirement and Benefit Plans.

(b)    For the year ended December 31, 2020, income taxes included $38.8 million related to the release of stranded tax effects upon Plan Termination, as discussed in Note 4, Income Taxes.