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Fair Value Measurements (Details) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Fair Value Measurements
Fair value of outstanding debt	$ 234,770,000
Carrying value of outstanding debt	$ 226,998,000	$ 207,197,000
Senior subordinated notes, interest rate	8.00%

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. 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, and after deducting unamortized discount or premiums, if any.

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