Operating Partnerships	12 Months Ended
Dec. 31, 2018
Operating Partnerships [Abstract]
Operating Partnerships [Text Block]	6. Operating Partnerships At December 31, 2018, approximately 4% of our consolidated multifamily apartment homes were held in Camden Operating, L.P. (“Camden Operating” or the “operating partnership”). Camden Operating has 11.9 million outstanding common limited partnership units and as of December 31, 2018, we held approximately 92% of the outstanding common limited partnership units and the sole 1% general partnership interest of the operating partnership. The remaining common limited partnership units, comprising approximately 0.8 million units, are primarily held by former officers, directors, and investors of Paragon Group, Inc., which we acquired in 1997. Each common limited partnership unit is redeemable for one common share of Camden Property Trust or cash at our election. Holders of common limited partnership units are not entitled to rights as shareholders prior to redemption of their common limited partnership units. No member of our management owns Camden Operating common limited partnership units. At December 31, 2018, approximately 33% of our consolidated multifamily apartment homes were held in Camden Summit Partnership, L.P. (the “Camden Summit Partnership”). Camden Summit Partnership has 22.8 million outstanding common limited partnership units and as of December 31, 2018, we held approximately 95% of the outstanding common limited partnership units and the sole 1% general partnership interest of Camden Summit Partnership. The remaining common limited partnership units, comprising approximately 1.0 million units, are primarily held by former officers, directors, and investors of Summit Properties Inc., which we acquired in 2005. Each common limited partnership unit is redeemable for one common share of Camden Property Trust or cash at our election and holders of common limited partnership units are not entitled to rights as shareholders prior to redemption of their common limited partnership units. No member of our management owns Camden Summit Partnership common limited partnership units, and two of our ten trust managers own Camden Summit Partnership common limited partnership units. During 2018, we entered into an agreement with certain holders of common units of limited partnership interest in the Camden Summit Partnership, which holders included two of our Trust Managers. This agreement modifies the original terms of the Tax Protection Agreement dated February 28, 2005 which states the Camden Summit Partnership must maintain a certain amount of secured debt until February 28, 2020 to protect the negative tax capital of the unitholders or reimburse the unitholders for income taxes incurred from the repayment of this indebtedness. Pursuant to this 2018 agreement, Camden Summit Partnership issued $100.0 million of unsecured debt with an unrelated third party which was guaranteed by Camden Property Trust. Additionally, each such unitholder agreed to indemnify Camden Property Trust for their portion of the unsecured debt equal to the amount of income and gain which would be required to be recognized by the unitholder due to their negative tax capital account; the indemnities are for a one-year period with an annual October 15 renewal right. These amounts were approximately $21.2 million in the aggregate for the two Trust Managers which are holders of common units of limited partner interest in Camden Summit Partnership. In return, Camden Summit Partnership agreed to extend the duration of the Tax Protection Agreement for two years for each year such unitholder's indemnification agreement remains in place.

6. Operating Partnerships

At December 31, 2018, approximately 4% of our consolidated multifamily apartment homes were held in Camden Operating, L.P. (“Camden Operating” or the “operating partnership”). Camden Operating has 11.9 million outstanding common limited partnership units and as of December 31, 2018, we held approximately 92% of the outstanding common limited partnership units and the sole 1% general partnership interest of the operating partnership. The remaining common limited partnership units, comprising approximately 0.8 million units, are primarily held by former officers, directors, and investors of Paragon Group, Inc., which we acquired in 1997. Each common limited partnership unit is redeemable for one common share of Camden Property Trust or cash at our election. Holders of common limited partnership units are not entitled to rights as shareholders prior to redemption of their common limited partnership units. No member of our management owns Camden Operating common limited partnership units.

At December 31, 2018, approximately 33% of our consolidated multifamily apartment homes were held in Camden Summit Partnership, L.P. (the “Camden Summit Partnership”). Camden Summit Partnership has 22.8 million outstanding common limited partnership units and as of December 31, 2018, we held approximately 95% of the outstanding common limited partnership units and the sole 1% general partnership interest of Camden Summit Partnership. The remaining common limited partnership units, comprising approximately 1.0 million units, are primarily held by former officers, directors, and investors of Summit Properties Inc., which we acquired in 2005. Each common limited partnership unit is redeemable for one common share of Camden Property Trust or cash at our election and holders of common limited partnership units are not entitled to rights as shareholders prior to redemption of their common limited partnership units. No member of our management owns Camden Summit Partnership common limited partnership units, and two of our ten trust managers own Camden Summit Partnership common limited partnership units.

During 2018, we entered into an agreement with certain holders of common units of limited partnership interest in the Camden Summit Partnership, which holders included two of our Trust Managers. This agreement modifies the original terms of the Tax Protection Agreement dated February 28, 2005 which states the Camden Summit Partnership must maintain a certain amount of secured debt until February 28, 2020 to protect the negative tax capital of the unitholders or reimburse the unitholders for income taxes incurred from the repayment of this indebtedness. Pursuant to this 2018 agreement, Camden Summit Partnership issued $100.0 million of unsecured debt with an unrelated third party which was guaranteed by Camden Property Trust. Additionally, each such unitholder agreed to indemnify Camden Property Trust for their portion of the unsecured debt equal to the amount of income and gain which would be required to be recognized by the unitholder due to their negative tax capital account; the indemnities are for a one-year period with an annual October 15 renewal right. These amounts were approximately $21.2 million in the aggregate for the two Trust Managers which are holders of common units of limited partner interest in Camden Summit Partnership. In return, Camden Summit Partnership agreed to extend the duration of the Tax Protection Agreement for two years for each year such unitholder's indemnification agreement remains in place.