Finance Receivables (Narratives) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Credit Quality Of Finance Receivables [Abstract]
Accounts receivable related to amounts billed under these direct financing leases	$ 0.2	$ 0.1
Allowance for credit losses related to financing leases		$ 3.1
Financing Receivable, Credit Quality, Additional Information	We generally seek investments in facilities that we believe are critical to each tenant’s business and that we believe have a low risk of tenant defaults. During the year ended December 31, 2011, we established an allowance for credit losses of $3.1 million. At June 30, 2012, none of the balances of our finance receivables were past due and we had not established any allowances for credit losses. Additionally, there have been no modifications of finance receivables during the six months ended June 30, 2012. We evaluate the credit quality of our tenant receivables utilizing an internal 5-point credit rating scale, with 1 representing the highest credit quality and 5 representing the lowest. The credit quality evaluation of our tenant receivables was last updated in the second quarter of 2012.
Financing Receivable, Credit Quality, Date Ratings Updated	Apr. 01, 2012

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