Debt (Narratives) (Details) (USD $)	3 Months Ended		6 Months Ended			6 Months Ended							6 Months Ended			6 Months Ended			6 Months Ended							0 Months Ended	6 Months Ended		1 Months Ended	3 Months Ended	6 Months Ended				6 Months Ended	0 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Fixed interest rate	Jun. 30, 2014 Variable interest rate	Jun. 30, 2014 Revolving Credit Facility	Jan. 31, 2014 Revolving Credit Facility	Dec. 31, 2013 Revolving Credit Facility	Jun. 30, 2014 Revolving Credit Facility	Jun. 30, 2014 Revolving Credit Facility Euro	Jun. 30, 2014 Revolving Credit Facility Maximum	Jun. 30, 2014 Revolving Credit Facility Maximum Eurocurrency	Jun. 30, 2014 Revolving Credit Facility Maximum Base Rate	Jun. 30, 2014 Revolving Credit Facility Minimum	Jun. 30, 2014 Revolving Credit Facility Minimum Eurocurrency	Jun. 30, 2014 Revolving Credit Facility Minimum Base Rate	Jun. 30, 2014 Term Loan Facility	Jan. 31, 2014 Term Loan Facility	Dec. 31, 2013 Term Loan Facility	Jun. 30, 2014 Term Loan Facility Maximum Eurocurrency	Jun. 30, 2014 Term Loan Facility Maximum Base Rate	Jun. 30, 2014 Term Loan Facility Minimum Eurocurrency	Jun. 30, 2014 Term Loan Facility Minimum Base Rate	Jan. 31, 2014 Senior Unsecured Credit Facility	Jun. 30, 2014 Senior Unsecured Credit Facility	Dec. 31, 2013 Senior Unsecured Credit Facility	Mar. 31, 2014 Senior Unsecured Notes	Mar. 31, 2014 Senior Unsecured Notes	Jun. 30, 2014 Senior Unsecured Notes	Jun. 30, 2014 Senior Unsecured Notes Moody's, Baa2 Rating	Jun. 30, 2014 Senior Unsecured Notes Standard & Poor's, BBB Rating	Jul. 31, 2013 Unsecured Term Loan	Jun. 30, 2014 Mortgage Loan loan	Jan. 31, 2014 CPA: 16 - Global	Jan. 31, 2014 CPA: 16 - Global Fixed interest rate loan	Jan. 31, 2014 CPA: 16 - Global Variable interest rate loan	Jan. 31, 2014 CPA: 16 - Global Unsecured Term Loan	Jun. 30, 2014 Merged Entities
Line of Credit Facility [Line Items]
Debt instrument, covenant compliance																											We were in compliance with all of these covenants at June 30, 2014.
Credit facility, maturity date								Jan. 31, 2018											Jan. 31, 2016
Debt scheduled to mature in 2016	$ 590,778,000		$ 590,778,000																$ 250,000,000
Debt scheduled to mature in 2018	525,381,000		525,381,000					226,700,000
Debt scheduled to mature after 2018	1,435,829,000		1,435,829,000																												500,000,000
Debt instrument stated interest rate														1.70%	0.70%		0.925%	0.00%				1.95%	0.95%	1.00%	0.00%				4.60%	4.60%
Debt financing cost																										7,900,000				4,200,000
Revolving Line Of Credit
Line of credit, maximum borrowing amount									1,000,000,000	450,000,000										250,000,000	175,000,000					1,250,000,000.00		625,000,000						300,000,000
Amount outstanding (line of credit)											125,000,000	101,700,000							250,000,000							765,000,000	476,700,000									170,000,000			170,000,000
Line of credit, amount available in foreign currency								500,000,000
Amount available for swing line loan								50,000,000
Amount available for letters of credit								50,000,000
Debt Instrument borrowing capacity fee (percentage)								0.20%					0.30%			0.125%
Increase in maximum line of credit borrowing amount								1,000,000
Line of credit facility, available								773,300,000
Debt instrument, basis spread on variable rate								1.10%											1.25%												0.30%
Maximum cash distribution, percent of Adjusted Funds from Operations																											95.00%
Maximum cash distribution																											100,000,000
Loss on extinguishment of debt gross																																			7,100,000
Gain (Loss) on extinguishment of debt, net of tax			344,000	(181,000)																						(2,100,000)									(5,900,000)
Loss in extinguishment of debt, discontinued operations	(249,000)	(28,000)	1,271,000	(98,000)																															1,200,000
Credit facility potential increase																											500,000,000
Senior Unsecured Notes
Debt instrument, face amount																													500,000,000	500,000,000
Percentage of par value received for debt issued																													99.639%	99.639%
Unamortized discount (premium)	(2,490,000)		(2,490,000)																										1,800,000	1,800,000	1,700,000									(4,200,000)
Debt instrument, effective interest rate																													4.645%	4.645%
Debt instrument, maturity date																													Apr. 01, 2024
Debt instrument, term																													10 years		3 months
Debt instrument, payment term																													ten-year term
Debt instrument, frequency of periodic payment																													semi-annually
Debt instrument, call feature																															The Senior Unsecured Notes can be redeemed at par within three months of maturity, or we can call the notes at any time for the principal, accrued interest and a make-whole amount based upon a rate of the ten-year U.S. Treasury yield plus 30 basis points.
Debt instrument, credit rating																																Baa2	BBB-
Non Recourse Debt
Collateral mortgage loan, carrying value	3,700,000,000		3,700,000,000		1,900,000,000
Mortgage loan on real estate, minimum interest rate						3.20%	1.20%
Mortgage loan on real estate, maximum interest rate						7.60%	7.60%
Debt instrument maturity date, range start			Dec. 31, 2014
Debt instrument maturity date, range end			Dec. 31, 2038
Amount of debt acquired																																					1,400,000,000	161,900,000
Mortgage loans on real estate, weighted average interest rate																																			5.30%		5.79%	3.63%
Number of loans assumed																																					97	18
Fair value market adjustment																																				9,800,000
Number of loans paid off in period																																			19
Prepayment of mortgage principal			201,820,000	40,492,000
Debt instrument remaining term																																			1 year 4 months 24 days
Payment for debt defeasance																																			7,200,000
Proceeds from mortgage financing			$ 6,550,000	$ 99,000,000