Summary of Significant Accounting Policies (Narratives) (Details)			1 Months Ended	12 Months Ended
	Jan. 01, 2016 USD ($)	Apr. 04, 2013 shares	Feb. 28, 2014 shares	Dec. 31, 2015 USD ($) vie segment	Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 USD ($) shares	Dec. 31, 2012 shares
Basis of Consolidation
Variable interest entities, count | vie				20
Stock repurchased during period, shares | shares		616,971	11,037
Real estate tax expense				$ 57,700,000	$ 59,800,000	$ 37,300,000
Foreign currency transaction (losses)				$ (800,000)	(400,000)	(200,000)
Prior period reclassification adjustment						$ 32,715,000
Other assets
Basis of Consolidation
Prior period reclassification adjustment					11,200,000
Deferred Tax Liability
Basis of Consolidation
Prior period reclassification adjustment					$ (11,200,000)
New Accounting Pronouncement, Early Adoption, Effect | Forecast | Other assets
Basis of Consolidation
Effects of early adoption of accounting principle	$ (12,600,000)
New Accounting Pronouncement, Early Adoption, Effect | Forecast | Non-Recourse Debt
Basis of Consolidation
Effects of early adoption of accounting principle	$ 12,600,000
Common Stock
Basis of Consolidation
Stock repurchased during period, shares | shares					11,037	616,971	416,408
Prior period reclassification adjustment					$ (60,900,000)
Treasury Stock
Basis of Consolidation
Prior period reclassification adjustment					(60,900,000)
Additional Paid-in Capital
Basis of Consolidation
Prior period reclassification adjustment					(28,800,000)
Distributions in Excess of Accumulated Earnings
Basis of Consolidation
Prior period reclassification adjustment					(32,100,000)
Total Equity
Basis of Consolidation
Prior period reclassification adjustment					$ 0
CPA: 16 - Global
Basis of Consolidation
Variable interest entities, count | vie				12
Building and building improvements | Maximum
Basis of Consolidation
Property, plant and equipment, useful life				40 years
Furniture and fixtures | Maximum
Basis of Consolidation
Property, plant and equipment, useful life				7 years
Internal-use software development costs | Minimum
Basis of Consolidation
Property, plant and equipment, useful life				3 years
Internal-use software development costs | Maximum
Basis of Consolidation
Property, plant and equipment, useful life				7 years
Real Estate Investments
Basis of Consolidation
Number of reportable segments | segment				1
Prior period reclassification adjustment						$ 32,715,000