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Summary of Significant Accounting Policies - Leasing Costs and Revenue Recognition (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) community | Dec. 31, 2016 USD ($) community | Dec. 31, 2015 USD ($) community
DEFERRED LEASING COSTS |  |  |
Unamortized gross balance of deferred leasing costs | $ 31,081 | $ 24,825 |
Accumulated amortization | 8,769 | 6,898 |
Deferred costs, leases under negotiation | $ 98 |  |
Weighted average amortization period for deferred leasing cost | 7 years 10 months |  |
Expected amortization expense for the five years |  |  |
Expected amortization expense, 2018 | $ 4,297 |  |
Expected amortization expense, 2019 | 3,699 |  |
Expected amortization expense, 2020 | 3,198 |  |
Expected amortization expense, 2021 | 2,604 |  |
Expected amortization expense, 2022 | 2,052 |  |
Expected amortization expense, thereafter | 6,462 |  |
Percentage rents earned | $ 10,168 | $ 10,169 | $ 10,062
Senior Living Communities | Five Star |  |  |
Expected amortization expense for the five years |  |  |
Number of communities managed | community | 70 | 68 | 60
Private senior living manager |  |  |
Expected amortization expense for the five years |  |  |
Number of properties acquired, referred to as managed properties | community | 5 |  |

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- Definition Deferred Costs, Leases Under Negotiation + References No definition available. + Details
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- References No definition available. + Details
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- Definition Amount of amortization expense expected to be recognized after the fifth fiscal year following the latest fiscal year for deferred leasing costs. + References No definition available. + Details
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- Definition Amount of amortization expense expected to be recognized during the fifth fiscal year following the latest fiscal year for deferred leasing costs. + References No definition available. + Details
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- Definition Amount of amortization expense expected to be recognized during the fourth fiscal year following the latest fiscal year for deferred leasing costs. + References No definition available. + Details
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- Definition Amount of amortization expense expected to be recognized during the next fiscal year following the latest fiscal year for deferred leasing costs. + References No definition available. + Details
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- Definition Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for deferred leasing costs. + References No definition available. + Details
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- Definition Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for deferred leasing costs. + References No definition available. + Details
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- Definition Represents the weighted average amortization period for deferred leasing costs. + References No definition available. + Details
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- Definition Represents the number of communities managed by a related party. + References No definition available. + Details
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- Definition Represents the number of properties acquired or agreed to be acquired by the entity during the period, which are referred by the entity as managed properties. + References No definition available. + Details
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- Definition For an unclassified balance sheet, the accumulated amortization, as of the reporting date, which represents the periodic charge to earnings of initial direct costs which have been deferred and are being allocated over the lease term in proportion to the recognition of rental income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=77902619&loc=d3e40588-112709 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77913719&loc=d3e40879-112712 + Details
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- Definition For an unclassified balance sheet, this element represents costs incurred by the lessor that are (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction. This amount is before considering accumulated amortization representing the periodic charge to earnings to recognize the deferred costs over the term of the related lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=77902619&loc=d3e40588-112709 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77902619&loc=d3e40246-112709 + Details
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- Definition This element represents the rental revenue earned during the period from lessee-operators based on revenues generated in their operations, generally in excess of a base amount. Such rental revenue is generally stipulated in the lease agreement, usually will provide for a fixed percentage of revenue to be paid as additional (or possibly only) rent due the lessor, and may be based on gross revenues, net revenues, or multiple variations thereof. Percentage rent is often required under leases with retail outlets located on premises owned by hoteliers, cruise lines, others in the hospitality industry, and shopping mall operators, among others. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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