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v3.22.1

Consolidated Statements of Changes in Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Capital In Excess of Par Value | Retained Earnings | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | ---
Beginning balance, (in shares) at Dec. 31, 2020 |  | 143,396 |  |  |
Beginning balance at Dec. 31, 2020 | $ 1,739,907 | $ 1,434 | $ 1,190,001 | $ 565,270 | $ (16,798)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 129,470 |  |  | 129,470 |
Other comprehensive income (loss) | 1,395 |  |  |  | 1,395
Purchase and retirement of common stock, (in shares) |  | (1,152) |  |  |
Purchase and retirement of common stock | (66,939) | $ (11) | (6,839) | (60,089) |
Issuance of common stock under employee stock purchase plan, (in shares) |  | 24 |  |  |
Issuance of common stock under employee stock purchase plan | 1,139 |  | 1,139 |  |
Issuance of common stock upon exercise of stock options, (in shares) |  | 433 |  |  |
Issuance of common stock upon exercise of stock options | 14,384 | $ 4 | 14,380 |  |
Stock-based compensation | 9,752 |  | 9,752 |  |
Ending balance, (in shares) at Mar. 31, 2021 |  | 142,701 |  |  |
Ending balance at Mar. 31, 2021 | $ 1,829,108 | $ 1,427 | 1,208,433 | 634,651 | (15,403)
Beginning balance, (in shares) at Dec. 31, 2021 | 138,449 | 138,449 |  |  |
Beginning balance at Dec. 31, 2021 | $ 1,860,763 | $ 1,384 | 1,246,608 | 632,614 | (19,843)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 190,308 |  |  | 190,308 |
Other comprehensive income (loss) | (8,338) |  |  |  | (8,338)
Purchase and retirement of common stock, (in shares) |  | (1,713) |  |  |
Purchase and retirement of common stock | (100,090) | $ (17) | (10,723) | (89,350) |
Issuance of common stock under employee stock purchase plan, (in shares) |  | 23 |  |  |
Issuance of common stock under employee stock purchase plan | 1,168 |  | 1,168 |  |
Issuance of common stock upon exercise of stock options, (in shares) |  | 460 |  |  |
Issuance of common stock upon exercise of stock options | 18,706 | $ 5 | 18,701 |  |
Stock-based compensation | $ 10,566 |  | 10,566 |  |
Ending balance, (in shares) at Mar. 31, 2022 | 137,219 | 137,219 |  |  |
Ending balance at Mar. 31, 2022 | $ 1,973,083 | $ 1,372 | $ 1,266,320 | $ 733,572 | $ (28,181)

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