Unconsolidated Real Estate Joint Ventures (Unaudited Condensed Financial Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Long-term debt	$ 1,383,392		$ 1,368,832
Note payable to EPR	0		0
Net income	41,206	21,390
Atlantic-EPR I and II [Member]
Rental properties, net	45,219	46,324
Cash	281	1,397
Long-term debt	11,720	12,126
Note payable to EPR	19,244	14,852
Partners' equity	18,594	19,127
Rental revenue	1,448	1,400
Net income	$ 520	$ 348

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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- Definition

The amount of ownership interest of different classes of partners in limited partnership.

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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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+ Details