Note 9 - Notes Payable	6 Months Ended
Jun. 30, 2014
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	9. Notes Payable During March 2014, the Company established a new $1.75 billion unsecured revolving credit facility (the “Credit Facility”) with a group of banks, which is scheduled to expire in March 2018 with two additional six-month options to extend the maturity date at the Company’s discretion to March 2019. This Credit Facility replaced the Company’s existing $1.75 billion unsecured revolving credit facility which was scheduled to mature in October 2015. The new Credit Facility, which can be increased to $2.25 billion through an accordion feature, accrues interest at a rate of LIBOR plus 92.5 basis points on drawn funds. In addition, the Credit Facility includes a $500 million sub-limit which provides the Company the opportunity to borrow in alternative currencies including Canadian dollars, British Pounds Sterling, Japanese Yen or euros. Pursuant to the terms of the Credit Facility, the Company, among other things, is subject to covenants requiring the maintenance of (i) maximum leverage ratios on both unsecured and secured debt and (ii) minimum interest and fixed coverage ratios. As of June 30, 2014, the Credit Facility had a balance of $337.6 million outstanding and $1.1 million appropriated for letters of credit. During April 2014, the Company issued $500.0 million of 7-year Senior Unsecured Notes at an interest rate of 3.20% payable semi-annually in arrears which are scheduled to mature in May 1, 2021. The Company used the net proceeds from the offering of $495.4 million after deducting the underwriting discount and offering expenses, for general corporate purposes including reducing borrowings under the Credit Facility and repayment of maturing debt. In connection with this issuance, the Company entered into a seventh supplemental indenture which, among other things, revised, for all securities created on or after the date of the seventh supplemental indenture, the definition of Unencumbered Total Asset Value, used to determine compliance with certain covenants within the indenture. During the six months ended June 30, 2014, the Company repaid (i) its $100.0 million 5.95% senior unsecured notes, which matured in June 2014 and (ii) its remaining $194.6 million 4.82% senior unsecured notes, which also matured in June 2014.

Note 9 - Notes Payable

6 Months Ended

Jun. 30, 2014

9. Notes Payable

During March 2014, the Company established a new $1.75 billion unsecured revolving credit facility (the “Credit Facility”) with a group of banks, which is scheduled to expire in March 2018 with two additional six-month options to extend the maturity date at the Company’s discretion to March 2019. This Credit Facility replaced the Company’s existing $1.75 billion unsecured revolving credit facility which was scheduled to mature in October 2015. The new Credit Facility, which can be increased to $2.25 billion through an accordion feature, accrues interest at a rate of LIBOR plus 92.5 basis points on drawn funds. In addition, the Credit Facility includes a $500 million sub-limit which provides the Company the opportunity to borrow in alternative currencies including Canadian dollars, British Pounds Sterling, Japanese Yen or euros. Pursuant to the terms of the Credit Facility, the Company, among other things, is subject to covenants requiring the maintenance of (i) maximum leverage ratios on both unsecured and secured debt and (ii) minimum interest and fixed coverage ratios. As of June 30, 2014, the Credit Facility had a balance of $337.6 million outstanding and $1.1 million appropriated for letters of credit.

During April 2014, the Company issued $500.0 million of 7-year Senior Unsecured Notes at an interest rate of 3.20% payable semi-annually in arrears which are scheduled to mature in May 1, 2021. The Company used the net proceeds from the offering of $495.4 million after deducting the underwriting discount and offering expenses, for general corporate purposes including reducing borrowings under the Credit Facility and repayment of maturing debt. In connection with this issuance, the Company entered into a seventh supplemental indenture which, among other things, revised, for all securities created on or after the date of the seventh supplemental indenture, the definition of Unencumbered Total Asset Value, used to determine compliance with certain covenants within the indenture.

During the six months ended June 30, 2014, the Company repaid (i) its $100.0 million 5.95% senior unsecured notes, which matured in June 2014 and (ii) its remaining $194.6 million 4.82% senior unsecured notes, which also matured in June 2014.

- Definition

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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