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EARNINGS PER SHARE - Reconciliation of weighted average shares outstanding (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
EARNINGS PER SHARE        
Net income available for stockholders: $ 4,818 $ 4,429 $ 8,739 $ 7,358
Less: Adjustments for earnings attributable to participating securities (152) (143) (306) (238)
Net income used in calculating earnings per share $ 4,666 $ 4,286 $ 8,433 $ 7,120
Weighted average shares outstanding (including participating securities) 38,363 37,026 38,330 37,025
Adjustment for participating securities (1,252) (1,255) (1,453) (1,250)
Shares used in calculating basic earnings per share (in shares) 37,111 35,771 36,877 35,775
Dilutive effect of stock based awards   94   199
Shares used in calculating diluted earnings per share (in shares) 37,111 35,865 36,877 35,974