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Stockholders Equity (Tables)
 3 Months Ended
Mar. 31, 2022
Equity [Abstract]  
Schedule of changes in equity
A schedule of consolidated changes in equity for the three months ended March 31, 2022 is as follows (number of shares in thousands):
Common
Stock
(Number of
Shares)		Common
Stock
(Amount)		Additional
Paid-In
Capital		Treasury
Stock
(Number of
Shares)		Treasury
Stock (Amount)		Retained
Earnings		Accumulated
Other
Non-Owner
Changes to
Equity		Total
Stockholders’
Equity
December 31, 202164,344 $643 $516,562 13,658 $(523,642)$1,587,041 $(151,838)$1,428,766 
Comprehensive income— — — — — 20,484 (2,590)17,894 
Dividends declared ($0.16 per share)

— — — — — (8,111)— (8,111)
Employee stock plans12 1 2,665 2 (49)(136)— 2,481 
March 31, 202264,356 $644 $519,227 13,660 $(523,691)$1,599,278 $(154,428)$1,441,030 

A schedule of consolidated changes in equity for the three months ended March 31, 2021 is as follows (number of shares in thousands):
Common
Stock
(Number of
Shares)		Common
Stock
(Amount)		Additional
Paid-In
Capital		Treasury
Stock
(Number of
Shares)		Treasury
Stock (Amount)		Retained
Earnings		Accumulated
Other
Non-Owner
Changes to
Equity		Total
Stockholders’
Equity
December 31, 202064,171 $642 $501,531 13,530 $(516,992)$1,519,811 $(122,315)$1,382,677 
Comprehensive income (loss)— — — — — 19,382 (44,902)(25,520)
Dividends declared ($0.16 per share)
— — — — — (8,104)— (8,104)
Employee stock plans12 — 2,406 1 (68)(24)— 2,314 
March 31, 202164,183 $642 $503,937 13,531 $(517,060)$1,531,065 $(167,217)$1,351,367