Organization, Basis of Presentation and Significant Accounting Policies (Details 3) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Lease income	$ 559,906	$ 521,126
Total revenue	560,792	522,326
Operating Segments \| Established Communities
Disaggregation of Revenue [Line Items]
Total revenue	417,544	382,757
Operating Segments \| Other Stabilized Communities
Disaggregation of Revenue [Line Items]
Total revenue	71,203	70,116
Non-allocated
Disaggregation of Revenue [Line Items]
Total revenue	886	1,200
Continuing Operations
Disaggregation of Revenue [Line Items]
Non-lease revenue	5,507	5,516
Lease income	552,060	504,104
Total revenue	557,567	509,620
Continuing Operations \| Management, development and other fees
Disaggregation of Revenue [Line Items]
Non-lease revenue	886	1,200
Continuing Operations \| Rental and non-rental related income
Disaggregation of Revenue [Line Items]
Non-lease revenue	4,621	4,316
Continuing Operations \| Operating Segments \| Established Communities
Disaggregation of Revenue [Line Items]
Non-lease revenue	2,399	2,224
Lease income	415,145	380,533
Total revenue	417,544	382,757
Continuing Operations \| Operating Segments \| Other Stabilized Communities
Disaggregation of Revenue [Line Items]
Non-lease revenue	1,817	1,687
Lease income	69,386	68,429
Total revenue	71,203	70,116
Continuing Operations \| Operating Segments \| Development/ Redevelopment Communities
Disaggregation of Revenue [Line Items]
Non-lease revenue	405	405
Lease income	67,529	55,142
Total revenue	67,934	55,547
Continuing Operations \| Operating Segments \| Management, development and other fees \| Established Communities
Disaggregation of Revenue [Line Items]
Non-lease revenue	0	0
Continuing Operations \| Operating Segments \| Management, development and other fees \| Other Stabilized Communities
Disaggregation of Revenue [Line Items]
Non-lease revenue	0	0
Continuing Operations \| Operating Segments \| Management, development and other fees \| Development/ Redevelopment Communities
Disaggregation of Revenue [Line Items]
Non-lease revenue	0	0
Continuing Operations \| Operating Segments \| Rental and non-rental related income \| Established Communities
Disaggregation of Revenue [Line Items]
Non-lease revenue	2,399	2,224
Continuing Operations \| Operating Segments \| Rental and non-rental related income \| Other Stabilized Communities
Disaggregation of Revenue [Line Items]
Non-lease revenue	1,817	1,687
Continuing Operations \| Operating Segments \| Rental and non-rental related income \| Development/ Redevelopment Communities
Disaggregation of Revenue [Line Items]
Non-lease revenue	405	405
Continuing Operations \| Non-allocated
Disaggregation of Revenue [Line Items]
Non-lease revenue	886	1,200
Lease income	0	0
Total revenue	886	1,200
Continuing Operations \| Non-allocated \| Management, development and other fees
Disaggregation of Revenue [Line Items]
Non-lease revenue	886	1,200
Continuing Operations \| Non-allocated \| Rental and non-rental related income
Disaggregation of Revenue [Line Items]
Non-lease revenue	$ 0	$ 0

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The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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