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v3.19.1

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
--- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Cumulative effect upon adoption of ASC 606 | $ 14,402 |  |  | $ 14,402 |
Beginning balance at Dec. 31, 2017 | 1,476,839 | $ 1,571 | $ 1,027,709 | 467,467 | $ (19,908)
Beginning balance, shares at Dec. 31, 2017 |  | 157,069 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 139,838 |  |  | 139,838 |
Other comprehensive gain | 1,747 |  |  |  | 1,747
Purchase and retirement of common stock | (82,256) | $ (11) | (5,461) | (76,784) |
Purchase and retirement of common stock, shares |  | (1,122) |  |  |
Issuance of common stock under employee stock purchase plan | 1,005 | $ 0 | 1,005 |  |
Issuance of common stock under the employee stock purchase plan, shares |  | 16 |  |  |
Issuance of common stock upon exercise of stock options | 56,884 | $ 20 | 56,864 |  |
Issuance of common stock upon exercise of stock options, shares |  | 2,027 |  |  |
Stock-based compensation | 5,195 |  | 5,195 |  |
Ending balance at Mar. 31, 2018 | 1,613,654 | $ 1,580 | 1,085,312 | 544,923 | (18,161)
Ending balance, shares at Mar. 31, 2018 |  | 157,990 |  |  |
Beginning balance at Dec. 31, 2018 | $ 1,593,147 | $ 1,536 | 1,106,641 | 517,970 | (33,000)
Beginning balance, shares at Dec. 31, 2018 | 153,634 | 153,634 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | $ 113,981 |  |  | 113,981 |
Other comprehensive gain | 4,280 |  |  |  | 4,280
Purchase and retirement of common stock | (88,789) | $ (17) | (9,202) | (79,570) |
Purchase and retirement of common stock, shares |  | (1,725) |  |  |
Issuance of common stock under employee stock purchase plan | 1,322 | $ 0 | 1,322 |  |
Issuance of common stock under the employee stock purchase plan, shares |  | 32 |  |  |
Issuance of common stock upon exercise of stock options | 7,571 | $ 4 | 7,567 |  |
Issuance of common stock upon exercise of stock options, shares |  | 335 |  |  |
Stock-based compensation | 5,038 |  | 5,038 |  |
Ending balance at Mar. 31, 2019 | $ 1,636,550 | $ 1,523 | $ 1,111,366 | $ 552,381 | $ (28,720)
Ending balance, shares at Mar. 31, 2019 | 152,276 | 152,276 |  |  |

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