Credit Facilities	9 Months Ended
Credit Facilities	Sep. 30, 2014
Debt Disclosure [Abstract]
Credit Facilities	Credit Facilities On May 19, 2014, the Company entered into an Amendment to the Amended and Restated Loan Agreement between the Company and Bank of America, N.A., dated February 14, 2012, (the "Amended Credit Agreement"), which provided for the continued arrangement for a line of credit with Bank of America, N.A. of $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 annual unused commitment fee is equal to 0.25%. Prior to the Amended Credit Agreement, the line of credit had been obligated to be secured by cash or investment collateral of at least $5.0 million. Accordingly, the Company maintained restricted investments of $4.5 million and restricted cash of $0.6 million as of December 31, 2013. The aggregate of these amounts was included in the line item "Restricted cash and investments," a component of current assets, on the Consolidated Balance Sheet as of December 31, 2013. Effective with the May 19, 2014 amendment, the line of credit is no longer secured by cash or investment collateral; instead the Company must maintain unencumbered liquid assets having an aggregate market value of not less than 100% of any outstanding principal amounts, in addition to the aggregate standby letters of credit issued, under the facility. The Amended Credit Agreement expires on June 30, 2015, at which time outstanding amounts borrowed under the agreement, if any, become due and payable. As of September 30, 2014 and December 31, 2013, the Company had no outstanding borrowings against its line of credit, but had outstanding letters of credit of $1.0 million and $1.6 million, respectively.

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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