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EARNINGS PER SHARE - Reconciliation of weighted average shares outstanding (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
EARNINGS PER SHARE        
Net income available for stockholders: $ 4,284 $ 3,103 $ 13,023 $ 10,461
Less: Adjustments for earnings attributable to participating securities (134) (101) (421) (339)
Net income used in calculating earnings per share $ 4,150 $ 3,002 $ 12,602 $ 10,122
Weighted average shares outstanding (including participating securities) 38,355 36,889 38,339 36,982
Adjustment for participating securities (1,201) (1,255) (1,263) (1,251)
Shares used in calculating basic earnings per share (in shares) 37,154 35,634 37,076 35,731
Dilutive effect of stock based awards   91   181
Shares used in calculating diluted earnings per share (in shares) 37,154 35,725 37,076 35,912