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LONG-TERM DEBT (Details) (USD $) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Borrowings [Abstract] |  |
Long-term debt | $ 236,151,000 | $ 238,396,000
Less: Current portion | (23,776,000) | (22,057,000)
Total long-term debt | 212,375,000 | 216,339,000
Unsecured Subordinated Notes Payable [Member] |  |
Borrowings [Abstract] |  |
Long-term debt | 2,719,000 | 3,870,000
Quarterly installments (in hundredths) | 5.00% |
Wells Fargo Bank, National Association [Member] | Line of Credit [Member] |  |
Borrowings [Abstract] |  |
Long-term debt | 118,901,000 | 104,526,000
Maximum borrowing capacity | 262,500,000 |
Wells Fargo Bank, National Association [Member] | Line of Credit [Member] | LIBOR [Member] |  |
Borrowings [Abstract] |  |
Basis spread on base rate (in hundredths) | 1.50% |
Wells Fargo Bank, National Association [Member] | Line of Credit [Member] | Prime rate [Member] |  |
Borrowings [Abstract] |  |
Basis spread on base rate (in hundredths) | 0.50% |
Wells Fargo Bank, National Association [Member] | Term Loan [Member] |  |
Borrowings [Abstract] |  |
Long-term debt | 114,531,000 | 130,000,000
Commitment fee (in hundredths) | 0.25% |
Incremental higher interest rate after acquisition (in hundredths) | 0.25% |
Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member] |  |
Borrowings [Abstract] |  |
Increase in borrowing capacity |  | 75,000,000
Incremental higher interest rate after acquisition (in hundredths) | 0.70% |
Available for borrowing under the facility | 118,500,000 |
Expiration date | Jul. 11, 2017 |
Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member] | Minimum [Member] |  |
Borrowings [Abstract] |  |
Commitment fee (in hundredths) | 0.20% |
Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member] | Maximum [Member] |  |
Borrowings [Abstract] |  |
Commitment fee (in hundredths) | 0.40% |
Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member] | LIBOR [Member] |  |
Borrowings [Abstract] |  |
Base rate | LIBOR |
Basis spread on base rate (in hundredths) | 1.75% |
Amount outstanding | $ 233,400,000 |
Weighted average interest rate (in hundredths) | 1.80% |
Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member] | LIBOR [Member] | Minimum [Member] |  |
Borrowings [Abstract] |  |
Basis spread on base rate (in hundredths) | 1.25% |
Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member] | LIBOR [Member] | Maximum [Member] |  |
Borrowings [Abstract] |  |
Basis spread on base rate (in hundredths) | 2.25% |
Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member] | Prime rate [Member] | Minimum [Member] |  |
Borrowings [Abstract] |  |
Basis spread on base rate (in hundredths) | 0.25% |
Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member] | Prime rate [Member] | Maximum [Member] |  |
Borrowings [Abstract] |  |
Basis spread on base rate (in hundredths) | 1.25% |

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