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SIGNIFICANT ACCOUNTING POLICIES - Reconciliation of weighted average shares outstanding (Details) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Earnings per Share |  |  |
Net income available for stockholders | $ 19,444 | $ 28,239 | $ 28,488
Less: Adjustments for earnings attributable to participating securities | (416) | (669) | (762)
Net income used in calculating earnings per share | $ 19,028 | $ 27,570 | $ 27,726
Weighted average shares outstanding (including participating securities) | 33,926 | 34,061 | 34,529
Adjustment for participating securities | (734) | (831) | (959)
Shares used in calculating diluted earnings per share | 33,192 | 33,230 | 33,570

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- Definition The total amount of dividends declared in the period for each class of stock and the contractual amount of dividends (or interest on participating income bonds) that must be paid for the period (for example, unpaid cumulative dividends). Dividends declared in the current period do not include dividends declared in respect of prior-period unpaid cumulative dividends. Preferred dividends that are cumulative only if earned are deducted only to the extent that they are earned. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121326447&loc=SL5780133-109256 + Details
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