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Mandatorily Redeemable Non-Controlling Interest (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
Changes in Carrying Amount of Redeemable Non-Controlling Interest [Roll Forward] |  |  |  |  |
Beginning balance | $ 69,190 | $ 45,974 |  |  |
Operating results allocated to mandatorily redeemable non-controlling interest partners | 6,055 | 4,057 |  |  |
Distributions to mandatorily redeemable non-controlling interest partners | (7,336) | (4,628) |  |  |
Changes in the redemption value of mandatorily redeemable non-controlling interest | 12,894 | 6,169 |  |  |
Payments for settlement of mandatorily redeemable non-controlling interest | (2,361) | (1,262) |  |  |
Purchases of businesses - initial liability related to mandatorily redeemable non-controlling interest | 10,282 | 18,880 |  |  |
Other | 119 | 0 |  |  |
Extinguishment of mandatorily redeemable non-controlling interest | (88,516) | 0 |  |  |
Ending balance | 327 | 69,190 |  |  |
Carrying Amount of Redeemable Non-Controlling Interest [Abstract] |  |  |  |  |
Contractual time period has lapsed but holder's employment has not been terminated |  |  | $ 327 |  | $ 24,700
Contractual time period has not lapsed and holder's employment has not been terminated |  |  | 0 |  | 46,949
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
Redemption value prior to excess distributed earnings |  |  | 327 |  | 71,649
Excess distributions over earnings and losses |  |  | 0 |  | (2,459)
Redeemable non-controlling interests | $ 69,190 | $ 69,190 | $ 327 |  | $ 69,190
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 |  |  |  |

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