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STOCKHOLDERS' EQUITY - Summary of Changes in Shareholders' Equity (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning balance (in shares) | 38,199,111 |
Beginning balance | $ 1,973,990 | $ 1,720,755
Net earnings | 71,152 | 25,412
Stock-based compensation expense | 6,437 | 5,861
Issuance of stock | 0 | 0
Share repurchases | $ (60,813) | (8,957)
Ending balance (in shares) | 37,597,457 |
Ending balance | $ 1,990,766 | $ 1,743,071
Common Stock [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning balance (in shares) | 38,199,000 | 38,073,000
Beginning balance | $ 382 | $ 381
Issuance of stock (in shares) | 398,000 | 400,000
Issuance of stock | $ 4 | $ 4
Share repurchases (in shares) | (1,000,000) | (209,000)
Share repurchases | $ (10) | $ (2)
Ending balance (in shares) | 37,597,000 | 38,264,000
Ending balance | $ 376 | $ 383
Additional Paid-in Capital [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning balance | 505,352 | 501,781
Stock-based compensation expense | 6,437 | 5,861
Issuance of stock | (4) | (4)
Share repurchases | (60,803) | (8,955)
Ending balance | 450,982 | 498,683
Retained Earnings [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning balance | 1,468,256 | 1,218,593
Net earnings | 71,152 | 25,412
Ending balance | $ 1,539,408 | $ 1,244,005

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- Definition Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=118258462&loc=d3e11149-113907 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=118258462&loc=d3e11178-113907 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116855982&loc=d3e4534-113899 + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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