Revolving Line of Credit	3 Months Ended
Revolving Line of Credit	Mar. 31, 2014
Debt Disclosure [Abstract]
Revolving Line of Credit	(3) Revolving Line of Credit In August 2010, we entered into a $150.0 million Credit Agreement (the “Credit Facility”) and a related pledge and security agreement with a group of seven financial institutions with Bank of America, N.A., as Administrative Agent. The Credit Facility provides for a revolving credit line of $150.0 million (which may be increased up to $200.0 million subject to our obtaining commitments for such increase), with a $25.0 million sublimit for letters of credit. The Credit Facility matures on August 11, 2014. Borrowings under the Credit Facility may be used for general corporate purposes, including working capital requirements, acquisitions and share repurchases. Borrowings under the Credit Facility bear interest at a rate of either (1) the Bank of America’s prime rate plus a margin of 1.50% to 2.75% or (2) the 30, 60, 90 or 180-day LIBOR rate plus a margin of 2.50% to 3.75%, with the margin determined by our consolidated leverage ratio. The Credit Facility is secured by substantially all of our assets, excluding real property. The Credit Facility requires us to maintain certain financial ratios and other financial conditions and prohibits us from making certain investments, advances, cash dividends or loans, and limits incurrence of additional indebtedness and liens. As of March 31, 2014, we were in compliance with those covenants. As of March 31, 2014, we had no outstanding borrowings and available borrowing capacity of $148.0 million under the Credit Facility. We had an outstanding letter of credit totaling $2.0 million as of March 31, 2014. Some of our customers require a letter of credit guaranteeing performance in connection with our contracts. The maximum potential amount of an outstanding performance bond would be the remaining cost of work to be performed under our contracts. The notional amount of performance guarantees outstanding as of March 31, 2014 was estimated to be $29.0 million. This letter of credit is issued under our revolving line of credit and reduces our available borrowing capacity. We do not believe this letter of credit will be required to be drawn upon. The letter of credit expires in 2014.

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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