Revolving Credit Facility	6 Months Ended
Revolving Credit Facility	Jun. 30, 2011
Revolving Credit Facility [Abstract]
Revolving Credit Facility	Note 7: Revolving Credit Facility In June 2011, we entered into a credit agreement governing our new $50.0 million revolving credit facility. The proceeds of the loans will be used to finance the construction and acquisition of our new corporate office and research facility. We currently expect to acquire the new facility during the first quarter of 2013. On the date of acquisition, the revolving loan balance will be converted to a five-year term loan. Borrowings under the loans will bear interest at a variable rate equal to one-month LIBOR plus a margin of 1.50 percentage points. The credit agreement requires us to maintain a total leverage ratio no greater than 3.50 to 1.00 and an interest coverage ratio greater than or equal to 2.50 to 1.00. In connection with the new credit agreement, we incurred debt issuance costs of $0.3 million which are recorded in other noncurrent assets and are being amortized as additional interest expense over the term of the credit facility. As of June 30, 2011, we had no balance outstanding under this new credit facility.

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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