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NOTES PAYABLE AND AMENDED CREDIT AGREEMENT (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 31, 2016 | Mar. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 05, 2013
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal payment due in 2017 |  |  | $ 2,345,000 |  |  |
Aggregate principal payment due in 2018 |  |  | 73,351,000 |  |  |
Notes Payable [Member] | 2015 Acquisition [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate amount of notes payable |  |  |  |  | $ 4,900,000 |
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 |
Payment of debt |  | $ 250,000 |  | $ 575,000 |  |
Notes Payable [Member] | 2016 Acquisition [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate amount of notes payable |  |  |  | 1,500,000 |  |
Aggregate principal payment due in 2017 |  |  |  | 250,000 |  |
Aggregate principal payment due in 2018 |  |  |  | $ 819,000 |  |
Average effective interest rate |  |  |  | 3.50% |  |
Payment of debt |  |  | 444,000 |  |  |
Notes Payable [Member] | 2017 Acquisition [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate amount of notes payable |  |  | 1,700,000 |  |  |
Aggregate principal payment due in 2018 |  |  | 625,000 |  |  |
Aggregate principal payment due in 2019 |  |  | $ 1,025,000 |  |  |
Average effective interest rate |  |  | 4.00% |  |  |
Minimum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Percentage of unused commitment fee |  |  | 0.10% |  |  |
Minimum [Member] | Notes Payable [Member] | 2015 Acquisition [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Average effective interest rate |  |  |  |  | 3.25% |
Minimum [Member] | LIBOR [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Spread on variable rate |  |  | 1.50% |  |  |
Minimum [Member] | Base Rate [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Spread on variable rate |  |  | 0.10% |  |  |
Maximum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Percentage of unused commitment fee |  |  | 0.25% |  |  |
Maximum [Member] | Notes Payable [Member] | 2015 Acquisition [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Average effective interest rate |  |  |  |  | 4.00% |
Maximum [Member] | LIBOR [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Spread on variable rate |  |  | 2.50% |  |  |
Maximum [Member] | Base Rate [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Spread on variable rate |  |  | 1.00% |  |  |
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 |  |  | $ 56,000,000 |  |  |
Average effective interest rate |  |  | 2.70% |  |  |
Credit Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Cash and noncash consideration with respect to acquisition after amendment | $ 50,000,000 |  |  |  |  |
Credit Agreement [Member] | Maximum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Cash dividends after amendment | $ 10,000,000 |  | $ 15,000,000 |  |  |

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