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RESTATEMENT AND REVISION OF PRIOR PERIOD FINANCIAL STATEMENTS Condensed Consolidated Balance Sheets - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018
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Accounting Changes and Error Corrections [Abstract] |  |  |  |  |
Allowance for uncollectible accounts receivable | $ 4,972 | $ 4,866 | $ 3,714 | $ 3,385 | $ 3,125
Preferred stock, no par value (in dollars per share) | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
Preferred stock, shares authorized (in shares) | 1,800,000 | 1,800,000 | 1,800,000 | 1,800,000 | 1,800,000
Preferred stock, shares issued (in shares) | 0 | 0 | 0 | 0 | 0
Common stock, no par value (in dollars per share) | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
Common stock, shares authorized (in shares) | 640,000,000 | 640,000,000 | 640,000,000 | 640,000,000 | 640,000,000
Common stock, shares issued (in shares) | 60,008,481 | 60,008,481 | 60,019,438 | 60,013,718 | 60,012,155
Common stock, shares outstanding (in shares) | 60,008,481 | 60,008,481 | 60,019,438 | 60,013,718 | 60,012,155
Preferred stock, shares authorized (in shares) | 900,000 | 900,000 | 900,000 | 900,000 | 900,000
Convertible preferred stock, shares issued (in shares) | 445,063 | 445,063 | 445,063 | 445,063 | 445,063
Convertible preferred stock, shares outstanding (in shares) | 445,063 | 445,063 | 445,063 | 445,063 | 445,063
Convertible preferred stock, liquidation preference | $ 20,444 | $ 20,111 | $ 20,111 | $ 19,777 | $ 19,777

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- Definition The aggregate liquidation preference (or restrictions) of stock classified as temporary equity that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + 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(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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