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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings attributable to common shareholders [Abstract]        
From operations prior to revaluation of redeemable non-controlling interests, net of tax $ 5,818 $ 5,216 $ 16,288 $ 15,876
Charges to additional paid-in-capital - revaluation of redeemable non-controlling interests, net of tax 0 0 (376) (1,086)
Net income (loss) attributable to redeemable non-controlling interest, total $ 5,818 $ 5,216 $ 15,912 $ 14,790
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) $ 0.47 $ 0.43 $ 1.32 $ 1.30
Charges to additional-paid-in-capital - revaluation of redeemable non-controlling interests, net of tax (in dollars per share) 0 0 (0.03) (0.09)
Basic (in dollars per share) 0.47 0.43 1.29 1.21
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) 0.47 0.43 1.32 1.30
Charges to additional paid-in-capital - revaluation of redeemable non-controlling interests, net of tax (in dollars per share) 0 0 (0.03) (0.09)
Diluted (in dollars per share) $ 0.47 $ 0.43 $ 1.29 $ 1.21
Shares used in computation [Abstract]        
Basic earnings per share - weighted-average shares (in shares) 12,421 12,244 12,382 12,201
Effect of dilutive securities - stock options (in shares) 0 3 0 7
Denominator for diluted earnings per share - adjusted weighted-average shares (in shares) 12,421 12,247 12,382 12,208