INDEBTEDNESS (Schedule of Long-term Debt and Capital Lease Obligations) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
INDEBTEDNESS [Abstract]
Borrowings on credit facility	$ 177,801	$ 178,062
Capital lease obligations	4,100	4,907
Subtotal	181,901	182,969
Less current portion	(2,403)	(3,137)
Total long-term debt and capital lease obligations	$ 179,498	$ 179,832

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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Amount borrowed under the credit facility as of the balance sheet date.

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Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date.

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