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NOTES PAYABLE AND CREDIT AGREEMENT - Additional Information (Details) (USD $) | 1 Months Ended |  |  | 9 Months Ended | 12 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 05, 2013 | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2014 Notes Payable, Other Payables [Member] Installment | Dec. 31, 2013 Notes Payable, Other Payables [Member] Installment | Dec. 31, 2012 Notes Payable, Other Payables [Member] Installment | Sep. 30, 2014 Minimum [Member] | Sep. 30, 2014 Maximum [Member] | Sep. 30, 2014 Revolving credit agreement average effective interest rate of 3.0% inclusive of unused fee [Member] | Dec. 05, 2013 Revolving credit agreement average effective interest rate of 3.0% inclusive of unused fee [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Revolving credit facility commitment |  |  |  |  |  |  |  |  |  | $ 125,000,000
Maturity Date | Nov. 30, 2018 |  |  |  |  |  |  |  |  |
Spread on Libor variable rate (in hundredths) |  |  |  |  |  |  | 1.50% | 2.50% |  |
Spread on base variable rate (in hundredths) |  |  |  |  |  |  | 0.10% | 1.00% |  |
Percentage of unused commitment fee (in hundredths) |  |  |  |  |  |  | 0.10% | 0.25% |  |
Revolving credit outstanding |  | 47,800,000 | 41,475,000 |  |  |  |  |  | 46,500,000 |
Remaining revolving credit outstanding |  |  |  |  |  |  |  |  | 78,500,000 |
Aggregate amount of Notes Payable |  |  |  | 400,000 | 1,300,000 | 350,000 |  |  |  |
Aggregate principal installments |  |  |  | $ 200,000 | $ 650,000 | $ 175,000 |  |  |  |
Average effective interest rate (in hundredths) |  |  |  | 3.25% | 3.25% | 3.25% |  |  |  |
Business Acquisition Purchase Price Allocation Notes Payable Number Of Installment |  |  |  | 2 | 2 | 2 |  |  |  |

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