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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2020
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, 2020, 2019, and 2018:
Dividends Per ShareAmount Paid
2020(in thousands)
First Quarter (a)$0.10 $4,645 
Second Quarter0.10 3,917 
Third Quarter (b)1.70 3,991 
Fourth Quarter (b)0.10 66,642 
Total$2.00 $79,195 
2019
First Quarter (a)$0.09 $4,053 
Second Quarter0.09 3,509 
Third Quarter0.09 3,508 
Fourth Quarter (c)1.10 42,884 
Total$1.37 $53,954 
2018
First Quarter (a)$0.07 $2,758 
Second Quarter0.07 2,723 
Third Quarter (c)1.07 41,632 
Fourth Quarter0.09 3,502 
Total$1.30 $50,615 
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(a)Includes payments of dividend equivalents on RSUs and PSUs which vested in first quarter of each year.

(b)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.
(c)During each fourth quarter 2019 and third quarter 2018, 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]
Changes in accumulated other comprehensive loss are as follows:
Changes in Accumulated Other Comprehensive Loss
Year Ended December 31
202020192018
(thousands)
Beginning Balance, net of taxes
$(50,248)$(47,652)$(76,702)
Net actuarial gain (loss), before taxes6,832 (4,642)14,178 
Amortization of actuarial (gain) loss, before taxes (a)
807 (175)1,497 
Effect of settlements, before taxes (a)
6,250 1,342 23,255 
Income taxes (b)35,281 879 (9,880)
Ending Balance, net of taxes
$(1,078)$(50,248)$(47,652)
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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 12, Retirement and Benefit Plans.

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