Revolving Credit Facility	6 Months Ended
Revolving Credit Facility	Jun. 30, 2013
Debt Disclosure [Abstract]
Revolving Credit Facility	Revolving Credit Facility At June 30, 2013, the Company maintained a line of credit with five commercial lenders (the "Unsecured Credit Facility") in the amount of $175,000,000, which matures in February 2015. At June 30, 2013, the Company had $153,000,000 outstanding under the Unsecured Credit Facility and $22,000,000 available for borrowings. The Unsecured Credit Facility charges interest at the prevailing 30-day LIBOR rate plus a fixed spread of 2.0%. The interest rate on amounts outstanding under the Unsecured Credit Facility was 2.25% at June 30, 2013. During the six months ended June 30, 2013, the Company received net proceeds of $50,500,000 from the Unsecured 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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