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Financial Instruments and Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010
Financial instruments and fair value measurements
Cash and cash equivalents, Carrying value	$ 5,178	$ 10,081	$ 5,149	$ 13,919
Accounts receivable, net, Carrying value	17,450	14,246
Accounts payable, Carrying value	6,426	6,203
Long-term debt (including current maturities), Carrying value	22,926	24,185
Carrying amount [Member]
Financial instruments and fair value measurements
Cash and cash equivalents, Carrying value	5,178	10,081
Accounts receivable, net, Carrying value	17,450	14,246
Accounts payable, Carrying value	6,426	6,203
Long-term debt (including current maturities), Carrying value	22,926	24,185
Fair value [Member]
Financial instruments and fair value measurements
Cash and cash equivalents, Fair value	5,178	10,081
Accounts receivable, net, Fair value	17,450	14,246
Accounts payable, Fair value	6,426	6,203
Long-term debt (including current maturities), Fair value	$ 22,926	$ 24,185

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Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of trade and related party payables existing as of the balance sheet date.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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