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v3.19.3

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, shares at Dec. 31, 2017 |  | 157,069 |  |  |
Beginning balance at Dec. 31, 2017 | $ 1,476,839 | $ 1,571 | $ 1,027,709 | $ 467,467 | $ (19,908)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 389,834 |  |  | 389,834 |
Other comprehensive loss | (8,955) |  |  |  | (8,955)
Purchase and retirement of common stock | (289,534) | $ (44) | (21,507) | (267,983) |
Purchase and retirement of common stock, shares |  | (4,419) |  |  |
Issuance of common stock under employee stock purchase plan | 3,258 | $ 1 | 3,257 |  |
Issuance of common stock under the employee stock purchase plan, shares |  | 57 |  |  |
Issuance of common stock upon exercise of stock options | 75,409 | $ 27 | 75,382 |  |
Issuance of common stock upon exercise of stock options, shares |  | 2,768 |  |  |
Stock-based compensation | 16,396 |  | 16,396 |  |
Dividends declared | (47,139) |  |  | (47,139) |
Ending balance at Sep. 30, 2018 | 1,630,510 | $ 1,555 | 1,101,237 | 556,581 | (28,863)
Ending balance, shares at Sep. 30, 2018 |  | 155,475 |  |  |
Beginning balance, shares at Jun. 30, 2018 |  | 156,800 |  |  |
Beginning balance at Jun. 30, 2018 | 1,590,882 | $ 1,568 | 1,094,771 | 522,764 | (28,221)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 128,319 |  |  | 128,319 |
Other comprehensive loss | (642) |  |  |  | (642)
Purchase and retirement of common stock | (102,636) | $ (17) | (8,117) | (94,502) |
Purchase and retirement of common stock, shares |  | (1,668) |  |  |
Issuance of common stock under employee stock purchase plan | 1,107 | $ 1 | 1,106 |  |
Issuance of common stock under the employee stock purchase plan, shares |  | 21 |  |  |
Issuance of common stock upon exercise of stock options | 7,602 | $ 3 | 7,599 |  |
Issuance of common stock upon exercise of stock options, shares |  | 322 |  |  |
Stock-based compensation | 5,878 |  | 5,878 |  |
Ending balance at Sep. 30, 2018 | $ 1,630,510 | $ 1,555 | 1,101,237 | 556,581 | (28,863)
Ending balance, shares at Sep. 30, 2018 |  | 155,475 |  |  |
Beginning balance, shares at Dec. 31, 2018 | 153,634 | 153,634 |  |  |
Beginning balance at Dec. 31, 2018 | $ 1,593,147 | $ 1,536 | 1,106,641 | 517,970 | (33,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 372,689 |  |  | 372,689 |
Other comprehensive loss | (2,780) |  |  |  | (2,780)
Purchase and retirement of common stock | (267,184) | $ (50) | (26,408) | (240,726) |
Purchase and retirement of common stock, shares |  | (4,950) |  |  |
Issuance of common stock under employee stock purchase plan | 3,392 | $ 1 | 3,391 |  |
Issuance of common stock under the employee stock purchase plan, shares |  | 77 |  |  |
Issuance of common stock upon exercise of stock options | 38,472 | $ 15 | 38,457 |  |
Issuance of common stock upon exercise of stock options, shares |  | 1,461 |  |  |
Stock-based compensation | 15,555 |  | 15,555 |  |
Dividends declared | (49,984) |  |  | (49,984) |
Ending balance at Sep. 30, 2019 | $ 1,703,307 | $ 1,502 | 1,137,636 | 599,949 | (35,780)
Ending balance, shares at Sep. 30, 2019 | 150,222 | 150,222 |  |  |
Beginning balance, shares at Jun. 30, 2019 |  | 150,955 |  |  |
Beginning balance at Jun. 30, 2019 | $ 1,634,501 | $ 1,509 | 1,122,068 | 541,664 | (30,740)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 132,168 |  |  | 132,168 |
Other comprehensive loss | (5,040) |  |  |  | (5,040)
Purchase and retirement of common stock | (81,367) | $ (15) | (7,469) | (73,883) |
Purchase and retirement of common stock, shares |  | (1,400) |  |  |
Issuance of common stock under employee stock purchase plan | 999 | $ 1 | 998 |  |
Issuance of common stock under the employee stock purchase plan, shares |  | 21 |  |  |
Issuance of common stock upon exercise of stock options | 16,593 | $ 7 | 16,586 |  |
Issuance of common stock upon exercise of stock options, shares |  | 646 |  |  |
Stock-based compensation | 5,453 |  | 5,453 |  |
Ending balance at Sep. 30, 2019 | $ 1,703,307 | $ 1,502 | $ 1,137,636 | $ 599,949 | $ (35,780)
Ending balance, shares at Sep. 30, 2019 | 150,222 | 150,222 |  |  |

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