Credit Facilities	9 Months Ended
Credit Facilities	Sep. 30, 2013
Debt Disclosure [Abstract]
Credit Facilities	Credit Facilities In May 2013, pursuant to the Amendment to Amended and Restated Loan Agreement between the Company and Bank of America, N.A., (the "Amended Credit Agreement"), the Company reduced its line of credit with Bank of America from $10.0 million to $5.0 million. Borrowings under this line of credit are available for investment opportunities, working capital, and the issuance of letters of credit. The annual interest rate on outstanding amounts is equal to a floating rate of 1-month LIBOR Daily Floating Rate plus 1.85%. The unused commitment fee is equal to 0.25%. In connection with the Amended Credit Agreement, the Company entered into a Pledge Agreement, which provides that the line of credit must be secured by cash or investment collateral. This restricted amount is included in the line item "Restricted cash and investments," a component of current assets, on the consolidated balance sheets. The Amended Credit Agreement expires June 12, 2014, at which time any outstanding amounts borrowed under the agreement are then due and payable. As of September 30, 2013 and December 31, 2012, the Company had no outstanding borrowings against its line of credit or the predecessor line of credit, but had outstanding letters of credit of $1.6 million on both dates.

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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