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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Earnings attributable to common shareholders [Abstract]        
From operations prior to revaluation of redeemable non-controlling interests, net of tax $ 6,304 $ 6,432 $ 10,470 $ 10,660
Charges to additional paid-in-capital - revaluation of redeemable non-controlling interests, net of tax (376) (119) (376) (1,086)
Net income (loss) attributable to redeemable non-controlling interest, total $ 5,928 $ 6,313 $ 10,094 $ 9,574
Basic earnings per share attributable to common shareholders [Abstract]        
From operations prior to revaluation of redeemable non-controlling interests, net of tax (in dollars per share) $ 0.51 $ 0.53 $ 0.85 $ 0.88
Charges to additional-paid-in-capital - revaluation of redeemable non-controlling interests, net of tax (in dollars per share) (0.03) (0.01) (0.03) (0.09)
Basic (in dollars per share) 0.48 0.52 0.82 0.79
Diluted earnings per share attributable to common shareholders [Abstract]        
From operations prior to revaluation of redeemable non-controlling interests, net of tax (in dollars per share) 0.51 0.53 0.85 0.87
Charges to additional paid-in-capital - revaluation of redeemable non-controlling interests, net of tax (in dollars per share) (0.03) (0.01) (0.03) (0.09)
Diluted (in dollars per share) $ 0.48 $ 0.52 $ 0.82 $ 0.78
Shares used in computation [Abstract]        
Basic earnings per share - weighted-average shares (in shares) 12,409 12,224 12,362 12,177
Effect of dilutive securities - stock options (in shares) 0 2 0 7
Denominator for diluted earnings per share - adjusted weighted-average shares (in shares) 12,409 12,226 12,362 12,184