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Stockholders Equity (Tables)
 3 Months Ended
Mar. 31, 2021
Equity [Abstract]  
Schedule of changes in equity
A schedule of consolidated changes in equity for the three months ended March 31, 2021 is as follows (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— — — — — 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 

A schedule of consolidated changes in equity for the three months ended March 31, 2020 is as follows (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, 201963,873 $639 $489,282 13,051 $(498,074)$1,489,176 $(210,495)$1,270,528 
Comprehensive income— — — — — 29,733 (34,189)(4,456)
Dividends declared ($0.16 per share)
— — — — — (8,133)— (8,133)
Common stock repurchases— — — 396 (15,550)— — (15,550)
Employee stock plans17 — 2,743 2 (84)(88)— 2,571 
March 31, 202063,890 $639 $492,025 13,449 $(513,708)$1,510,688 $(244,684)$1,244,960