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REDEEMABLE NON-CONTROLLING INTEREST (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2019 | Dec. 31, 2018
Changes in Carrying Amount of Redeemable Non-Controlling Interests [Roll Forward] |  |  |  |
Beginning balance | $ 133,943 |  |  |
Ending balance | 137,196 | $ 133,943 |  |
Carrying Amount (Fair Value) of Redeemable Non-Controlling Interest [Abstract] |  |  |  |
Fair value | 137,196 | 133,943 | $ 137,196 | $ 133,943
Redeemable Non-Controlling Interest [Member] |  |  |  |
Changes in Carrying Amount of Redeemable Non-Controlling Interests [Roll Forward] |  |  |  |
Beginning balance | 133,943 | 102,572 |  |
Operating results allocated to redeemable non-controlling interest partners | 2,395 | 8,433 |  |
Distributions to redeemable non-controlling interest partners | (1,522) | (9,835) |  |
Changes in the fair value of redeemable non-controlling interest | 4,661 | 24,770 |  |
Purchases of redeemable non-controlling interest | (2,281) | 8,145 |  |
Other | 0 | (142) |  |
Ending balance | 137,196 | 133,943 |  |
Carrying Amount (Fair Value) of Redeemable Non-Controlling Interest [Abstract] |  |  |  |
Contractual time period has lapsed but holder's employment has not been terminated |  |  | 48,058 | 42,624
Contractual time period has not lapsed and holder's employment has not been terminated |  |  | 89,138 | 91,319
Holder's employment has terminated and contractual time period has expired |  |  | 0 | 0
Holder's employment has terminated and contractual time period has not expired |  |  | 0 | 0
Fair value | $ 133,943 | $ 133,943 | $ 137,196 | $ 133,943
Therapy Practice [Member] | Minimum [Member] |  |  |  |
Business Combination, Description [Abstract] |  |  |  |
Business acquisition, percentage of limited partnership acquired |  |  | 50.00% |
Therapy Practice [Member] | Maximum [Member] |  |  |  |
Business Combination, Description [Abstract] |  |  |  |
Business acquisition, percentage of limited partnership acquired |  |  | 90.00% |
Therapy Practice [Member] | NewCo. [Member] |  |  |  |
Business Combination, Description [Abstract] |  |  |  |
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 Combination, Description [Abstract] |  |  |  |
Employment agreement term | 3 years |  |  |
Non-Compete agreement term regardless of whether the selling shareholder is employed | 5 years |  |  |
Therapy Practice [Member] | NewCo. [Member] | Maximum [Member] |  |  |  |
Business Combination, Description [Abstract] |  |  |  |
Employment agreement term | 5 years |  |  |
Non-Compete agreement term regardless of whether the selling shareholder is employed | 6 years |  |  |

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- Definition As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (16)(c) -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 15 -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (12)(c) -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 14 -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 + Details
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