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STOCKHOLDERS' EQUITY - Summary of Changes in Shareholders' Equity (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Beginning balance (in shares) |  |  |  | 40,330,741 |  |
Beginning balance |  |  |  | $ 1,576,825 | $ 1,421,495 |
Adoption of ASU 2014-09 | [1] |  |  |  |  | $ (583)
Net earnings |  | $ 54,135 | $ 42,550 | 151,847 | 107,702 |
Stock-based compensation expense |  |  |  | 13,748 | 9,911 |
Exercise/vesting of stock-based awards |  |  |  | 0 | 0 |
Share repurchases |  |  |  | $ (29,353) |  |
Ending balance (in shares) |  | 39,966,166 |  | 39,966,166 |  |
Ending balance |  | $ 1,712,484 | $ 1,539,108 | $ 1,712,484 | $ 1,539,108 |
Common Stock [Member] |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Beginning balance (in shares) |  |  |  | 40,331,000 | 40,031,000 |
Beginning balance |  |  |  | $ 403 | $ 400 |
Exercise/vesting of stock-based awards (in shares) |  |  |  | 321,000 | 295,000 |
Exercise/vesting of stock-based awards |  |  |  | $ 4 | $ 3 |
Share repurchases (in shares) |  |  |  | (686,000) |  |
Share repurchases |  |  |  | $ (7) |  |
Ending balance (in shares) |  | 39,966,000 | 40,326,000 | 39,966,000 | 40,326,000 |
Ending balance |  | $ 400 | $ 403 | $ 400 | $ 403 |
Additional Paid-in Capital [Member] |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Beginning balance |  |  |  | 584,578 | 572,506 |
Stock-based compensation expense |  |  |  | 13,748 | 9,911 |
Exercise/vesting of stock-based awards |  |  |  | (4) | (3) |
Share repurchases |  |  |  | (29,346) |  |
Ending balance |  | 568,976 | 582,414 | 568,976 | 582,414 |
Retained Earnings [Member] |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Beginning balance |  |  |  | 991,844 | 848,589 |
Adoption of ASU 2014-09 | [1] |  |  |  |  | $ (583)
Net earnings |  |  |  | 151,847 | 107,702 |
Ending balance |  | $ 1,143,108 | $ 956,291 | $ 1,143,108 | $ 956,291 |
[1] | Refer to Note 1 for additional information related to the adoption of ASU 2014-09.

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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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