Concentrations of Credit Risk	12 Months Ended
Concentrations of Credit Risk	Dec. 31, 2011
Concentrations of Credit Risk
Concentrations of Credit Risk	(18) Concentrations of Credit Risk Financial instruments, which potentially subject the Company to concentrations of credit risk, consist principally of cash, cash equivalents, investments and accounts receivable. The Company places its cash with high-quality financial institutions. At times, such amounts may be in excess of Federal Deposit Insurance Corporation insurance limits of $250,000. There were no credit based sales for 2011, 2010 or 2009.

The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date.

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+ Details