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COMMON STOCK REPURCHASE AND ISSUANCE - Repurchase Program November 2014 (Details) - USD ($) $ in Thousands		12 Months Ended
	Nov. 12, 2014	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Equity, Class of Treasury stock
Value of shares repurchased		$ 140	$ 4,096	$ 3,695
Repurchase program November 2014
Equity, Class of Treasury stock
Share repurchase program, Authorized amount	$ 40,000
Share repurchase program, Period in force	24 months
Shares repurchased under program		72,739	2,054,655	1,563,302
Value of shares repurchased		$ 100	$ 4,100	$ 3,700

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Amount of stock repurchase plan authorized.

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Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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