Revolving Credit Facility	3 Months Ended
Revolving Credit Facility	Mar. 31, 2013
Revolving Credit Facility [Abstract]
Revolving Credit Facility	4. Revolving Credit Facility We have a $100 million revolving credit facility (the "Facility"), which may be increased to $150 million based on the terms and subject to the conditions set forth in the agreement relating to the Facility (the "Credit Agreement"). The Facility matures on September 15, 2015. The Facility contains both affirmative and negative covenants, which we believe are customary for arrangements of this nature. At March 31, 2013, we were in compliance with all financial covenants under the Credit Agreement and had not drawn on the 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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