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EARNINGS PER SHARE - Stock Buyback (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2020 | Dec. 18, 2019 | May 31, 2018
EARNINGS PER SHARE |  |  |  |  |  |
Authorized amount | $ 150,000 |  |  |  |  |
Authorized program period repurchase | 30 months |  |  |  |  |
Authorized amount increase |  |  |  |  | $ 25,100 | $ 50,000
Remaining authorized repurchase amount |  | $ 38,400 |  | $ 38,400 |  |
Amount paid to repurchase shares |  | $ 4,331 | $ 7,248 | $ 11,579 |  |
Number of shares repurchased |  | 73 |  | 243 |  |
Average repurchase price per share |  | $ 59.70 |  | $ 47.70 |  |

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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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 Reference 3: 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 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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