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v3.3.1.900

Notes Payable (Details) |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 11, 2016 USD ($) | Dec. 05, 2013 USD ($) | Dec. 31, 2015 USD ($) Installment | Dec. 31, 2014 USD ($) Clinic Installment | Dec. 31, 2013 USD ($) Installment
Debt Instrument [Line Items] |  |  |  |  |
Number of annual installments | Installment |  |  | 2 |  |
Aggregate principal payment due in 2016 |  |  | $ 775,000 |  |
Aggregate principal payment due in 2017 |  |  | 559,000 |  |
Aggregate principal payment due in 2018 |  |  | 45,930,000 |  |
Aggregate principal payment due in 2019 |  |  | 1,846,000 |  |
Number of clinic-practice acquisition | Clinic |  |  |  | 13 |
Notes Payable, Other Payables [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate amount of notes payable |  |  |  | $ 500,000 | $ 1.3
Aggregate principal installments |  |  |  | $ 233,000 | $ 650,000
Average effective interest rate |  |  |  | 3.25% | 3.25%
Number of annual installments | Installment |  |  |  | 2 | 2
Notes Payable [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate amount of notes payable |  |  | 4,900,000 |  |
Aggregate principal payment due in 2016 |  |  | 575,000 |  |
Aggregate principal payment due in 2017 |  |  | 525,000 |  |
Aggregate principal payment due in 2018 |  |  | 1,900,000 |  |
Aggregate principal payment due in 2019 |  |  | $ 1,900,000 |  |
Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Spread on Libor variable rate |  |  | 1.50% |  |
Spread on base variable rate |  |  | 0.10% |  |
Percentage of unused commitment fee |  |  | 0.10% |  |
Minimum [Member] | Notes Payable [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Average effective interest rate |  |  | 3.25% |  |
Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Spread on Libor variable rate |  |  | 2.50% |  |
Spread on base variable rate |  |  | 1.00% |  |
Percentage of unused commitment fee |  |  | 0.25% |  |
Maximum [Member] | Notes Payable [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Average effective interest rate |  |  | 3.50% |  |
Credit Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Cash and noncash consideration with respect to acquisition | $ 25,000,000 |  |  |  |
Cash and noncash consideration with respect to acquisition after amendment | 50,000,000 |  |  |  |
Cash dividends | 7,500,000 |  |  |  |
Cash dividends after amendment | $ 10,000,000 |  |  |  |
Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Revolving credit facility commitment |  | $ 125,000,000 |  |  |
Revolving credit facility maturity date |  | Nov. 30, 2018 |  |  |
Remaining revolving credit outstanding |  |  | $ 81,000,000 |  |
Average effective interest rate |  |  | 2.50% |  |

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