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EARNINGS PER SHARE - Earnings per share attributable to common stock and restricted shares of common stock (Details 1) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Line Items]
Basic Earnings per share (in dollars per share)	$ 0.12	$ 0.08	$ 0.20	$ 0.13
Common stock
Earnings Per Share [Line Items]
Basic Earnings per share (in dollars per share)	0.12	0.08	0.20	0.13
Restricted shares of common stock
Earnings Per Share [Line Items]
Basic Earnings per share (in dollars per share)	$ 0.12	$ 0.08	$ 0.19	$ 0.13

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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