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FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying Value (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Credit Facility
Fair Value Of Instruments [Line Items]
Carrying value of debt	$ 352,500	$ 385,000
Fair value of debt	356,686	385,000
Senior Notes
Fair Value Of Instruments [Line Items]
Carrying value of debt	217,349	217,103
Fair value of debt	241,257	216,696
Finance Method Lease Obligations
Fair Value Of Instruments [Line Items]
Carrying value of debt	12,610	12,610
Letter of credit
Fair Value Of Instruments [Line Items]
Carrying value of debt	$ 570	$ 570

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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