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MANDATORILY REDEEMABLE NON-CONTROLLING INTERESTS (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2017
Changes in Carrying Amount of Redeemable Non-Controlling Interest [Roll Forward]    
Beginning balance $ 69,190  
Operating results allocated to mandatorily redeemable non-controlling interest partners 1,294  
Distributions to mandatorily redeemable non-controlling interest partners (1,052)  
Changes in the redemption value of mandatorily redeemable non-controlling interest 2,669  
Payments for settlement of mandatorily redeemable non-controlling interest (2,230)  
Purchases of businesses - initial liability related to mandatorily redeemable non-controlling interests 10,283  
Other 0  
Ending balance 80,154  
Carrying Amount of Redeemable Non-Controlling Interest [Abstract]    
Contractual time period has lapsed but holder's employment has not been terminated   $ 25,823
Contractual time period has not lapsed and holder's employment has not been terminated   56,548
Holder's employment has terminated and contractual time period has expired   0
Holder's employment has terminated and contractual time period has not expired   0
Redemption value prior to excess distributed earnings   82,371
Excess distributions over earnings and losses   (2,217)
Redeemable non-controlling interests $ 80,154 $ 80,154
Therapy Practice [Member] | Minimum [Member]    
Business Acquisition [Line Items]    
Business acquisition, percentage of limited partnership acquired   50.00%
Therapy Practice [Member] | Maximum [Member]    
Business Acquisition [Line Items]    
Business acquisition, percentage of limited partnership acquired   90.00%
Therapy Practice [Member] | NewCo. [Member]    
Business Acquisition [Line Items]    
Percentage of equity interest of subsidiary contributed for acquisition   100.00%
Business acquisition, percentage of general partnership interest acquired   100.00%
Business acquisition, consideration payable, term of note 2 years  
Employment agreement renewal term 1 year  
Non-Compete agreement term under condition of termination of employment of employed selling shareholder 2 years  
Therapy Practice [Member] | NewCo. [Member] | Minimum [Member]    
Business Acquisition [Line Items]    
Employment agreement term 3 years  
Non-Compete agreement term regardless of whether the selling shareholder is employed 5 years  
Required redemption term, under condition of termination of employment of employed selling shareholders 3 years  
Therapy Practice [Member] | NewCo. [Member] | Maximum [Member]    
Business Acquisition [Line Items]    
Employment agreement term 5 years  
Non-Compete agreement term regardless of whether the selling shareholder is employed 6 years  
Required redemption term, under condition of termination of employment of employed selling shareholders 5 years