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Redeemable Non-Controlling Interest (Details) $ in Thousands | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) Installment | Sep. 30, 2016 USD ($) | [2] | Jun. 30, 2016 USD ($) | [2] | Mar. 31, 2016 USD ($) | [2] | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | [2] | Jun. 30, 2015 USD ($) | [2] | Mar. 31, 2015 USD ($) | [2]
Changes in Carrying Amount of Mandatorily Redeemable Non-Controlling Interests [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance | [2] | $ 45,974 | [1] | $ 40,365 |  |  |  |  |  |  |  |  |  |
Operating results allocated to mandatorily redeemable non-controlling interest partners |  | 4,057 |  | 3,538 | [2] |  |  |  |  |  |  |  |  |
Distributions to mandatorily redeemable non-controlling interest partners |  | (4,628) |  | (3,740) | [2] |  |  |  |  |  |  |  |  |
Changes in the redemption value of mandatorily redeemable non-controlling interest |  | 6,169 |  | 2,670 | [2] |  |  |  |  |  |  |  |  |
Payments for settlement of mandatorily redeemable non-controlling interest |  | (1,262) |  | (9,192) | [2] |  |  |  |  |  |  |  |  |
Purchases of businesess - initial liability related to mandatorily redeemable non-controlling interests |  | 18,880 |  | 12,291 | [2] |  |  |  |  |  |  |  |  |
Other |  | 0 |  | 42 | [2] |  |  |  |  |  |  |  |  |
Ending balance |  | 69,190 |  | 45,974 | [1],[2] |  |  |  |  |  |  |  |  |
Carrying Amount of Redeemable Non-Controlling Interest [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual time period has lapsed but holder's employment has not been terminated |  |  |  |  |  | $ 24,700 |  |  |  | $ 19,969 | [2] |  |  |
Contractual time period has not lapsed and holder's employment has not been terminated |  |  |  |  |  | 46,949 |  |  |  | 27,893 | [2] |  |  |
Holder's employment has terminated and contractual time period has expired |  |  |  |  |  | 0 |  |  |  | 0 | [2] |  |  |
Holder's employment has terminated and contractual time period has not expired |  |  |  |  |  | 0 |  |  |  | 0 | [2] |  |  |
Redemption value prior to excess distributed earnings |  |  |  |  |  | 71,649 |  |  |  | 47,862 | [2] |  |  |
Excess distributions over earnings and losses |  |  |  |  |  | (2,459) |  |  |  | (1,888) | [2] |  |  |
Redeemable non-controlling interests |  | $ 69,190 |  | $ 45,974 | [1],[2] | $ 69,190 | $ 61,276 | $ 59,932 | $ 58,481 | 45,974 | [1],[2] | $ 45,323 | $ 49,166 | $ 45,578
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of installments | Installment |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Aggregate principal payment due in 2018 |  |  |  |  |  | $ 48,750 |  |  |  |  |  |  |  |
Aggregate principal payment due in 2019 |  |  |  |  |  | 1,846 |  |  |  |  |  |  |  |
Notes Payable [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount of notes payable |  |  |  |  |  | $ 100 |  |  |  | $ 3,100 |  |  |  |
Number of installments | Installment |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Average effective interest rate |  | 3.25% |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal payment due in 2018 |  |  |  |  |  | $ 1,200 |  |  |  |  |  |  |  |
Aggregate principal payment due in 2019 |  |  |  |  |  | $ 1,900 |  |  |  |  |  |  |  |
Therapy Practice [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, consideration payable, term of note |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |
[1] | Mandatorily redeemable non-controlling interests
[2] | as restated

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