Indebtedness	9 Months Ended
Sep. 30, 2015
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	Indebtedness In March 2015, the Company used proceeds from its unsecured credit facility together with available cash on hand to repay all $300 million of its 5.125% senior unsecured notes due March 2015. In March 2015, the Company issued $400 million of 3.75% senior unsecured notes due 2025. The net proceeds from this issuance were used to repay borrowings under the Company's unsecured credit facility and for general corporate purposes. In August 2015, the Company used proceeds from its unsecured credit facility to prepay without penalty a $105.8 million 7.0% mortgage loan due February 2016.

Indebtedness

9 Months Ended

Sep. 30, 2015

Indebtedness

In March 2015, the Company used proceeds from its unsecured credit facility together with available cash on hand to repay all $300 million of its 5.125% senior unsecured notes due March 2015.

In March 2015, the Company issued $400 million of 3.75% senior unsecured notes due 2025. The net proceeds from this issuance were used to repay borrowings under the Company's unsecured credit facility and for general corporate purposes.

In August 2015, the Company used proceeds from its unsecured credit facility to prepay without penalty a $105.8 million 7.0% mortgage loan due February 2016.