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STOCKHOLDERS' EQUITY - Summary of Changes in Shareholders' Equity (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jan. 01, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Beginning balance (in shares) |  | 38,072,659 |  |  | 38,072,659 |  |
Beginning balance | $ 1,743,071 | $ 1,720,755 | $ 1,625,332 | $ 1,576,825 | $ 1,720,755 | $ 1,576,825 |
Adoption of ASU 2014-09 |  |  |  |  |  |  | $ (583)
Net earnings | 50,828 | 25,412 | 53,838 | 43,874 | $ 76,240 | 97,712 |
Stock-based compensation expense | $ 4,201 | 5,861 | 3,770 | 5,216 |  |  |
Issuance of stock |  | 0 | 0 | 0 |  |  |
Share repurchases |  | (8,957) |  |  |  |  |
Ending balance (in shares) | 38,266,742 |  |  |  | 38,266,742 |  |
Ending balance | $ 1,798,100 | $ 1,743,071 | $ 1,682,940 | $ 1,625,332 | $ 1,798,100 | $ 1,682,940 |
Common Stock [Member] |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Beginning balance (in shares) | 38,264,000 | 38,073,000 | 40,632,000 | 40,331,000 | 38,073,000 | 40,331,000 |
Beginning balance | $ 383 | $ 381 | $ 406 | $ 403 | $ 381 | $ 403 |
Issuance of stock (in shares) | 3,000 | 400,000 | 17,000 | 301,000 |  |  |
Issuance of stock |  | $ 4 | $ 0 | $ 3 |  |  |
Share repurchases (in shares) |  | (209,000) |  |  |  |  |
Share repurchases |  | $ (2) |  |  |  |  |
Ending balance (in shares) | 38,267,000 | 38,264,000 | 40,649,000 | 40,632,000 | 38,267,000 | 40,649,000 |
Ending balance | $ 383 | $ 383 | $ 406 | $ 406 | $ 383 | $ 406 |
Additional Paid-in Capital [Member] |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 498,683 | 501,781 | 589,791 | 584,578 | 501,781 | 584,578 |
Stock-based compensation expense | 4,201 | 5,861 | 3,770 | 5,216 |  |  |
Issuance of stock |  | (4) | 0 | (3) |  |  |
Share repurchases |  | (8,955) |  |  |  |  |
Ending balance | 502,884 | 498,683 | 593,561 | 589,791 | 502,884 | 593,561 |
Retained Earnings [Member] |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 1,244,005 | 1,218,593 | 1,035,135 | 991,844 | 1,218,593 | 991,844 |
Adoption of ASU 2014-09 |  |  |  |  |  |  | $ (583)
Net earnings | 50,828 | 25,412 | 53,838 | 43,874 |  |  |
Ending balance | $ 1,294,833 | $ 1,244,005 | $ 1,088,973 | $ 1,035,135 | $ 1,294,833 | $ 1,088,973 |

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