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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Earnings per share attributable to common shareholders [Abstract]        
Prior to revaluation of redeemable non-controlling interests, net of tax $ 7,071 $ 6,304 $ 12,399 $ 10,470
Charges to additional paid-in-capital - revaluation of redeemable non-controlling interests, net of tax 0 (376) 0 (376)
Net income attributable to common shareholders $ 7,071 $ 5,928 $ 12,399 $ 10,094
Basic earnings per share attributable to common shareholders [Abstract]        
Prior to revaluation of redeemable non-controlling interests, net of tax (in dollars per share) $ 0.57 $ 0.51 $ 0.99 $ 0.85
Charges to additional paid-in-capital - revaluation of redeemable non-controlling interests, net of tax (in dollars per share) 0 (0.03) 0 (0.03)
Basic earnings per share attributable to common shareholders (in dollars per share) 0.57 0.48 0.99 0.82
Diluted earnings per share attributable to common shareholders [Abstract]        
Prior to revaluation of redeemable non-controlling interests, net of tax (in dollars per share) 0.57 0.51 0.99 0.85
Charges to additional paid-in-capital - revaluation of redeemable non-controlling interests, net of tax (in dollars per share) 0 (0.03) 0 (0.03)
Diluted earnings per share attributable to common shareholders (in dollars per share) $ 0.57 $ 0.48 $ 0.99 $ 0.82
Shares used in computation [Abstract]        
Basic and diluted earnings per share - weighted-average shares (in shares) 12,511 12,409 12,480 12,362