Notes and Bonds Payable	6 Months Ended
Notes and Bonds Payable	Jun. 30, 2014
Debt Disclosure [Abstract]
Notes and Bonds Payable	Notes and Bonds Payable In February 2014, the Company entered into a $200.0 million unsecured term loan facility ("Term Loan due 2019") with a syndicate of nine lenders that matures on February 26, 2019. The Term Loan due 2019 bears interest at a rate equal to (x) LIBOR plus (y) a margin ranging from 1.00% to 1.95% (currently 1.45%) based upon the Company's unsecured debt ratings. Payments under the Term Loan due 2019 are interest only, with the full amount of the principal due at maturity. The Term Loan due 2019 may be prepaid at any time, without penalty. The proceeds from the Term Loan due 2019 were used by the Company to repay borrowings on its unsecured revolving credit facility due 2017. The Term Loan due 2019 has various financial covenant provisions that are required to be met on a quarterly and annual basis that are equivalent to those of the unsecured revolving credit facility due 2017. The Company was in compliance with the financial covenant provisions at June 30, 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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