Schedule III - Real Estate and Accumulated Depreciation - Accumulated Depreciation Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Real Estate Subject To Operating Lease
Schedule III, Reconciliation of Carrying Amount of Real Estate Investments
Beginning balance	$ 5,308,211	$ 4,976,685	$ 2,506,804
Dispositions	(446,144)	(19,597)	(137,018)
Additions	404,161	548,521	2,785,863
Foreign currency translation adjustment	(94,738)	(181,064)	(157,262)
Impairment charges	(41,660)	(25,773)	(20,677)
Reclassification from real estate under construction	28,989	55,362	0
Improvements	16,169	24,014	18,474
Reclassification from direct financing lease	9,740	0	13,663
Write-off of fully depreciated assets	(2,461)	(6,443)	0
Reclassification to assets held for sale	0	(63,494)	(33,162)
Ending balance	5,182,267	5,308,211	4,976,685
Schedule III, Reconciliation of Real Estate Accumulated Depreciation
Beginning balance	372,735	253,627	168,076
Depreciation expense	142,432	137,144	112,758
Dispositions	(35,172)	(1,566)	(20,740)
Foreign currency translation adjustment	(5,240)	(6,159)	(5,318)
Write-off of fully depreciated assets	(2,461)	(6,443)	0
Reclassification to assets held for sale	0	(3,868)	(1,149)
Ending balance	472,294	372,735	253,627
Operating Real Estate
Schedule III, Reconciliation of Carrying Amount of Real Estate Investments
Beginning balance	82,749	84,885	6,024
Dispositions	(3,188)	(2,663)	0
Additions	0	0	78,423
Reclassification from real estate under construction	608	0	0
Improvements	1,542	527	438
Ending balance	81,711	82,749	84,885
Schedule III, Reconciliation of Real Estate Accumulated Depreciation
Beginning balance	8,794	4,866	882
Depreciation expense	4,235	4,275	3,984
Dispositions	(886)	(347)	0
Ending balance	$ 12,143	$ 8,794	$ 4,866