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NOTES PAYABLE AND AMENDED CREDIT AGREEMENT (Details) - USD ($) | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015 | Dec. 05, 2013
Debt Instrument [Line Items] |  |  |  |
Aggregate principal payment due in 2017 |  | $ 1,470,000 |  |
Aggregate principal payment due in 2018 |  | $ 39,076,000 |  |
Notes Payable, Other Payables [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 |
Notes Payable [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Average effective interest rate |  | 3.50% |  |
Aggregate amount of notes payable |  | $ 1,000,000 |  |
Aggregate principal payment due in 2017 |  | 444,000 |  |
Aggregate principal payment due in 2018 |  | $ 570,000 |  |
Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percentage of unused commitment fee |  | 0.10% |  |
Minimum [Member] | Notes Payable, Other Payables [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, Other Payables [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Average effective interest rate |  |  | 3.50% |
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] |  |  |  |
Average effective interest rate |  | 2.50% |  |
Revolving credit facility commitment |  |  |  | $ 125,000,000
Revolving credit facility maturity date |  | Nov. 30, 2018 |  |
Remaining revolving credit outstanding |  | $ 89,000,000 |  |
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 |  |  |

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