Fair Value Measurements (Narratives) (Details) (USD $)	9 Months Ended						3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		1 Months Ended
	Sep. 30, 2014 CPA: 16 - Global Maximum	Sep. 30, 2014 CPA: 16 - Global Minimum	Sep. 30, 2014 Redeemable noncontrolling interest Maximum	Sep. 30, 2014 Redeemable noncontrolling interest Minimum	Sep. 30, 2014 Deferred acquisition fees receivable Maximum	Sep. 30, 2014 Deferred acquisition fees receivable Minimum	Sep. 30, 2014 Fair Value, Measurements, Nonrecurring Level 3	Sep. 30, 2013 Fair Value, Measurements, Nonrecurring Level 3	Sep. 30, 2014 Fair Value, Measurements, Nonrecurring Level 3	Sep. 30, 2013 Fair Value, Measurements, Nonrecurring Level 3	Sep. 30, 2014 Fair Value, Measurements, Nonrecurring Level 3 Continuing Operations	Sep. 30, 2013 Fair Value, Measurements, Nonrecurring Level 3 Continuing Operations	Sep. 30, 2014 Fair Value, Measurements, Nonrecurring Level 3 Continuing Operations	Sep. 30, 2013 Fair Value, Measurements, Nonrecurring Level 3 Continuing Operations	Sep. 30, 2014 Fair Value, Measurements, Nonrecurring Level 3 Continuing Operations Real Estate	Sep. 30, 2013 Fair Value, Measurements, Nonrecurring Level 3 Continuing Operations Real Estate	Sep. 30, 2014 Fair Value, Measurements, Nonrecurring Level 3 Continuing Operations Real Estate	Sep. 30, 2013 Fair Value, Measurements, Nonrecurring Level 3 Continuing Operations Real Estate	Sep. 30, 2014 Fair Value, Measurements, Nonrecurring Level 3 Continuing Operations Net investments in direct financing leases	Sep. 30, 2013 Fair Value, Measurements, Nonrecurring Level 3 Continuing Operations Net investments in direct financing leases	Sep. 30, 2014 Fair Value, Measurements, Nonrecurring Level 3 Continuing Operations Net investments in direct financing leases	Sep. 30, 2013 Fair Value, Measurements, Nonrecurring Level 3 Continuing Operations Net investments in direct financing leases	Sep. 30, 2014 Fair Value, Measurements, Nonrecurring Level 3 Continuing Operations Equity method investments	Sep. 30, 2013 Fair Value, Measurements, Nonrecurring Level 3 Continuing Operations Equity method investments	Sep. 30, 2014 Fair Value, Measurements, Nonrecurring Level 3 Continuing Operations Equity method investments	Sep. 30, 2013 Fair Value, Measurements, Nonrecurring Level 3 Continuing Operations Equity method investments	Sep. 30, 2014 Fair Value, Measurements, Nonrecurring Level 3 Discontinued Operations	Sep. 30, 2013 Fair Value, Measurements, Nonrecurring Level 3 Discontinued Operations	Sep. 30, 2014 Fair Value, Measurements, Nonrecurring Level 3 Discontinued Operations	Sep. 30, 2013 Fair Value, Measurements, Nonrecurring Level 3 Discontinued Operations	Sep. 30, 2014 Fair Value, Measurements, Nonrecurring Level 3 Discontinued Operations Real Estate	Sep. 30, 2013 Fair Value, Measurements, Nonrecurring Level 3 Discontinued Operations Real Estate	Sep. 30, 2014 Fair Value, Measurements, Nonrecurring Level 3 Discontinued Operations Real Estate	Sep. 30, 2013 Fair Value, Measurements, Nonrecurring Level 3 Discontinued Operations Real Estate	Oct. 31, 2014 Subsequent Event Revolving Credit Facility
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Repayment of debt																																			$ 225,800,000
Fair value inputs
Lack of marketability			30.00%	20.00%
Discount rate	15.75%	12.75%	26.00%	22.00%
EBITDA Multiple			5	3
Gen and admin to assets ratio	0.45%	0.35%
Leverage adjusted unsecured spread					3.55%	1.09%
Illiquidity Adjustment					1.00%	0.50%
Impairment charges on properties							$ 4,225,000	$ 7,970,000	$ 7,026,000	$ 18,056,000	$ 4,225,000	$ 6,554,000	$ 7,026,000	$ 12,082,000	$ 3,472,000	$ 0	$ 5,538,000	$ 0	$ 753,000	$ 0	$ 753,000	$ 0	$ 0	$ 6,554,000	$ 735,000	$ 12,082,000	$ 0	$ 1,416,000	$ 0	$ 5,974,000	$ 0	$ 1,416,000	$ 0	$ 4,903,000