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SHAREHOLDERS' EQUITY (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	12 Months Ended
	Aug. 10, 2015	Jan. 27, 2015	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2016	Dec. 31, 2015
Consideration to repurchase shares						$ 4,542	$ 3,111
Shares repurchased						967,408	614,033
Amount of dividend paid			$ 0	$ 0	$ 0
Ordinary shares [Member]
Shares repurchased						2,902,224	1,842,099
American Depositary Shares [Member]
Consideration to repurchase shares	$ 20,000
Shares repurchased			0	0	0
American Depositary Shares [Member] | Maximum
Price per share	$ 7.99
Common Class A [Member]
Conversion of Stock, Shares Converted		45,787,948			45,787,948
Common Stock, Shares, Outstanding			84,463,737	84,454,047
Common Class B [Member]
Conversion of Stock, Shares Issued		45,787,948
Common Stock, Shares, Outstanding			45,787,948	45,787,948

X

- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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The cash outflow to reacquire common and preferred stock.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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