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STOCKHOLDERS' EQUITY (Tables) | 9 Months Ended
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Sep. 30, 2020
Stockholders' Equity Note [Abstract] |
Summary of Changes in Shareholders' Equity | A summary of changes in stockholders’ equity is presented below (in thousands):
|  | Nine Months Ended September 30, 2020 |  |  |  |  |  |  |  |
|  | (In thousands) |  |  |  |  |  |  |  |
|  | Number of Shares |  | Common Stock |  | Additional Paid-In Capital |  | Retained Earnings |  | Total
Balance at December 31, 2019 |  | 38,199 |  |  | $ | 382 |  |  | $ | 505,352 |  |  | $ | 1,468,256 |  |  | $ | 1,973,990 |
Net earnings |  | — |  |  | — |  |  | — |  |  | 71,152 |  |  | 71,152 |
Stock-based compensation expense |  | — |  |  | — |  |  | 6,437 |  |  | — |  |  | 6,437 |
Issuance of stock |  | 398 |  |  | 4 |  |  | (4) |  |  | — |  |  | — |
Share repurchases |  | (1,000) |  |  | (10) |  |  | (60,803) |  |  | — |  |  | (60,813) |
Balance at March 31, 2020 |  | 37,597 |  |  | $ | 376 |  |  | $ | 450,982 |  |  | $ | 1,539,408 |  |  | $ | 1,990,766 |
Net earnings |  | — |  |  | — |  |  | — |  |  | 90,678 |  |  | 90,678 |
Stock-based compensation expense |  | — |  |  | — |  |  | 3,157 |  |  | — |  |  | 3,157 |
Issuance of stock |  | 6 |  |  | 1 |  |  | (1) |  |  | — |  |  | — |
Balance at June 30, 2020 |  | 37,603 |  |  | 377 |  |  | 454,138 |  |  | 1,630,086 |  |  | 2,084,601 |
Net earnings |  | — |  |  | — |  |  | — |  |  | 109,118 |  |  | 109,118 |
Stock-based compensation expense |  | — |  |  | — |  |  | 6,130 |  |  | — |  |  | 6,130 |
Issuance of stock |  | 9 |  |  | — |  |  | — |  |  | — |  |  | — |
Balance at September 30, 2020 |  | 37,612 |  |  | $ | 377 |  |  | $ | 460,268 |  |  | $ | 1,739,204 |  |  | $ | 2,199,849 |
|  | Nine Months Ended September 30, 2019 |  |  |  |  |  |  |  |
|  | (In thousands) |  |  |  |  |  |  |  |
|  | Number of Shares |  | Common Stock |  | Additional Paid-In Capital |  | Retained Earnings |  | Total
Balance at December 31, 2018 |  | 38,073 |  |  | $ | 381 |  |  | $ | 501,781 |  |  | $ | 1,218,593 |  |  | $ | 1,720,755 |
Net earnings |  | — |  |  | — |  |  | — |  |  | 25,412 |  |  | 25,412 |
Stock-based compensation expense |  | — |  |  | — |  |  | 5,861 |  |  | — |  |  | 5,861 |
Issuance of stock |  | 400 |  |  | 4 |  |  | (4) |  |  | — |  |  | — |
Share repurchases |  | (209) |  |  | (2) |  |  | (8,955) |  |  | — |  |  | (8,957) |
Balance at March 31, 2019 |  | 38,264 |  |  | $ | 383 |  |  | $ | 498,683 |  |  | $ | 1,244,005 |  |  | $ | 1,743,071 |
Net earnings |  | — |  |  | — |  |  | — |  |  | 50,828 |  |  | 50,828 |
Stock-based compensation expense |  | — |  |  | — |  |  | 4,201 |  |  | — |  |  | 4,201 |
Issuance of stock |  | 3 |  |  | — |  |  | — |  |  | — |  |  | — |
Balance at June 30, 2019 |  | 38,267 |  |  | 383 |  |  | 502,884 |  |  | 1,294,833 |  |  | 1,798,100 |
Net earnings |  | — |  |  | — |  |  | — |  |  | 69,809 |  |  | 69,809 |
Stock-based compensation expense |  | — |  |  | — |  |  | 5,657 |  |  | — |  |  | 5,657 |
Issuance of stock |  | 32 |  |  | — |  |  | — |  |  | — |  |  | — |
Balance at September 30, 2019 |  | 38,299 |  |  | $ | 383 |  |  | $ | 508,541 |  |  | $ | 1,364,642 |  |  | $ | 1,873,566 |

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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