Investments In Direct Financing Lease (Narrative) (Details) (USD $)	3 Months Ended		12 Months Ended	3 Months Ended				0 Months Ended
	Mar. 31, 2014	Mar. 31, 2013 properties	Dec. 31, 2013	Mar. 31, 2014 Minimum [Member] years	Mar. 31, 2014 Maximum [Member] years	Mar. 31, 2014 Imagine Schools [Member] properties	Dec. 31, 2013 Imagine Schools [Member] properties	Apr. 21, 2014 Subsequent Event [Member]	Apr. 02, 2014 Subsequent Event [Member] properties
Length of lease (in years)				18	21
number of properties sold		5							4
Capital Leases, Net Investment in Direct Financing Leases, Initial Direct Costs	$ 1,700,000		$ 1,700,000
Number of public charter school properties (in properties)						27	27,000
Allowance for lease losses	0		0
Payments to Acquire Productive Assets	68,500,000							117,700,000
Proceeds from Sale of Property, Plant, and Equipment									$ 46,100,000