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Real Estate (Narrative) (Details) | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |
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Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) properties | Sep. 30, 2018 USD ($) | Sep. 30, 2019 Master_Leases | Sep. 30, 2019 properties | Sep. 30, 2019 | Sep. 30, 2019 shares | Sep. 30, 2019 beds_or_units | Sep. 30, 2019 USD ($) | Sep. 30, 2019 renewalOptions | Dec. 31, 2018 USD ($)
Number of Real Estate Properties | properties |  |  |  |  |  |  |  |  |  | 222 |  |  |  |  |  |
Number of States in which Entity Operates |  |  |  |  |  |  |  |  |  |  | 34 |  |  |  |  |
Nonportfolio Assets, Original Cost |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,508,000 |  |
Real Estate Investment Property, Portfolio Assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,057,775,000 |  |
Number of Lessees |  |  |  |  |  |  |  |  |  |  | 31 |  |  |  |  |
Real Estate Investments During The Period |  |  |  |  |  |  | $ 265,117,000 |  |  |  |  |  |  |  |  |
Payments to Acquire Real Estate |  |  |  |  |  |  | $ 209,227,000 | $ 129,558,000 |  |  |  |  |  |  |  |
Lease Renewal Period In Years | 5 years |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Incentive to Lessee |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,948,000 |  | $ 7,456,000
Escrow Deposit |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,208,000 |  | 8,208,000
Loans and Leases Receivable, Commitments, Fixed Rates |  |  |  |  |  |  | $ 309,250,000 |  |  |  |  |  |  |  |  |
Operating Leases, Income Statement, Lease Revenue | $ (75,247,000) |  | $ (71,688,000) |  |  |  | (218,777,000) | (210,809,000) |  |  |  |  |  |  |  |
Straight Line Rent |  |  |  |  |  |  | $ 16,255,000 | 17,516,000 |  |  |  |  |  |  |  |
Document Period End Date |  |  |  |  |  |  | Sep. 30, 2019 |  |  |  |  |  |  |  |  |
Loan and Lease Losses and Recoveries, Net | $ 0 |  | 0 |  |  |  | $ 2,500,000 | 1,849,000 |  |  |  |  |  |  |  |
Real Estate Held-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,420,000 |  | $ 0
Wingate Healthcare [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Real Estate Properties Acquired | properties |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Real Estate Investments During The Period |  |  |  |  |  |  | $ 52,200,000 |  |  |  |  |  |  |  |  |
Number of Units in Real Estate Property | beds_or_units |  |  |  |  |  |  |  |  |  |  |  |  | 267 |  |  |
Payments to Acquire Real Estate |  |  |  |  |  |  | 50,300,000 |  |  |  |  |  |  |  |  |
Asset Purchase Transaction Costs |  |  |  |  |  |  | $ 300,000 |  |  |  |  |  |  |  |  |
Lessor, Operating Lease, Term of Contract | 10 years |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |
Number Of Additional Lease Renewal Options | renewalOptions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |
Lease Renewal Period In Years | 5 years |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Initial lease rate |  |  |  |  |  |  |  |  |  |  | 7.50% |  |  |  |  |
Capital Improvements Commitment |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,900,000 |  |
Contingent Incentive Payments |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |
Holiday Lease Amendment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Real Estate Properties Acquired | properties |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Real Estate Investments During The Period |  |  |  |  |  |  | $ 38,000,000 |  |  |  |  |  |  |  |  |
Lease Escalator Minimum |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |
Lease Escalator Maximum |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |
Holiday Acquisition Holdings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties | properties |  |  |  |  |  |  |  |  |  | 26 |  |  |  |  |  |
Initial lease rate |  |  |  |  |  |  |  |  |  |  | 6.71% |  |  |  |  |
Operating Leases, Income Statement, Lease Revenue | $ (10,176,000) |  | $ (10,954,000) |  |  |  | $ (30,283,000) | $ (32,863,000) |  |  |  |  |  |  |  |
Percentage of Continuing Revenue | 12.00% |  | 15.00% |  |  |  | 13.00% | 15.00% |  |  |  |  |  |  |  |
Straight Line Rent | $ (1,664,000) |  | $ (1,530,000) |  |  |  | $ (4,958,000) | $ (4,591,000) |  |  |  |  |  |  |  |
Comfort Care Senior Living [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lessor, Operating Lease, Term of Contract | 10 years |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |
Number Of Additional Lease Renewal Options | renewalOptions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Lease Renewal Period In Years | 5 years |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Initial lease rate |  |  |  |  |  |  |  |  |  |  | 7.75% |  |  |  |  |
Discovery Senior Living [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Real Estate Properties Acquired | properties |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |
Real Estate Investments During The Period |  |  |  |  |  |  | $ 127,917,000 |  |  |  |  |  |  |  |  |
Number of Units in Real Estate Property | beds_or_units |  |  |  |  |  |  |  |  |  |  |  |  | 596 |  |  |
Asset Purchase Transaction Costs |  |  |  |  |  |  | $ 1,067,000 |  |  |  |  |  |  |  |  |
Lessor, Operating Lease, Term of Contract | 10 years |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |
Number Of Additional Lease Renewal Options | renewalOptions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Lease Renewal Period In Years | 5 years |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Initial lease rate |  |  |  |  |  |  |  |  |  |  | 6.50% |  |  |  |  |
Contingent Incentive Payments |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 |  |
Long-term Purchase Commitment, Amount |  |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |
Loans and Leases Receivable, Commitments, Fixed Rates |  |  |  |  |  |  | $ 750,000 |  |  |  |  |  |  |  |  |
Note Receivable Interest Rate |  |  |  |  |  |  |  |  |  |  | 7.00% |  |  |  |  |
Cappella Living Solutions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Real Estate Properties Acquired | properties |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Number of Units in Real Estate Property | beds_or_units |  |  |  |  |  |  |  |  |  |  |  |  | 51 |  |  |
Payments to Acquire Real Estate |  |  |  |  |  |  | $ 7,600,000 |  |  |  |  |  |  |  |  |
Asset Purchase Transaction Costs |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |
Lessor, Operating Lease, Term of Contract | 15 years |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |
Initial lease rate |  |  |  |  |  |  |  |  |  |  | 7.25% |  |  |  |  |
BAKA Enterprises [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lessor, Operating Lease, Term of Contract | 8 years |  |  |  |  |  | 8 years |  |  |  |  |  |  |  |  |
Operating Leases, Income Statement, Lease Revenue | $ (150,000) |  | (247,000) |  |  |  | $ (925,000) | $ (1,041,000) |  |  |  |  |  |  |  |
Percentage of Continuing Revenue |  |  |  |  |  |  | 0.00% | 1.00% |  |  |  |  |  |  |  |
Lease Payment, NOI Based, Percent |  |  |  |  |  |  |  |  |  |  | 95.00% |  |  |  |  |
Bickford Senior Living [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties | properties |  |  |  |  |  |  |  |  |  | 51 |  |  |  |  |  |
Number Of Real Estate Properties Acquired | properties |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Minimum Annual Lease Income |  |  |  |  |  |  | $ 39,707,000 |  |  |  |  |  |  |  |  |
Loans and Leases Receivable, Commitments, Fixed Rates |  |  |  |  |  |  | 42,700,000 |  |  |  |  |  |  |  |  |
Operating Leases, Income Statement, Lease Revenue | $ (13,285,000) |  | $ (12,937,000) |  |  |  | $ (39,796,000) | $ (36,792,000) |  |  |  |  |  |  |  |
Percentage of Continuing Revenue | 16.00% |  | 17.00% |  |  |  | 17.00% | 17.00% |  |  |  |  |  |  |  |
Straight Line Rent | $ (1,117,000) |  | $ (1,169,000) |  |  |  | $ (3,812,000) | $ (3,541,000) |  |  |  |  |  |  |  |
Senior Living Communities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties | properties |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  |  |
Number of Units in Real Estate Property | beds_or_units |  |  |  |  |  |  |  |  |  |  |  |  | 2,068 |  |  |
Lessor, Operating Lease, Term of Contract | 15 years |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |
Number Of Additional Lease Renewal Options |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  | 2 |
Lease Renewal Period In Years | 5 years |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Note Receivable Interest Rate |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |
Operating Leases, Income Statement, Lease Revenue | $ (11,924,000) |  | $ (11,469,000) |  |  |  | $ (35,001,000) | $ (34,374,000) |  |  |  |  |  |  |  |
Percentage of Continuing Revenue | 15.00% |  | 15.00% |  |  |  | 15.00% | 16.00% |  |  |  |  |  |  |  |
Straight Line Rent | $ (1,404,000) |  | $ (1,359,000) |  |  |  | $ (3,519,000) | $ (4,076,000) |  |  |  |  |  |  |  |
Lease Escalator Rate after Lease Year 4 |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |
National Healthcare Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties | properties |  |  |  |  |  |  |  |  |  | 42 |  |  |  |  |  |
Operating Leases, Income Statement, Lease Revenue | $ (9,461,000) |  | $ (9,389,000) |  |  |  | $ (28,670,000) | $ (28,453,000) |  |  |  |  |  |  |  |
Percentage of Continuing Revenue | 12.00% |  | 13.00% |  |  |  | 12.00% | 13.00% |  |  |  |  |  |  |  |
Number of Master Leases | Master_Leases |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Lessor Equity Shares Owned, Significant Lessee | shares |  |  |  |  |  |  |  |  |  |  |  | 1,630,462 |  |  |  |
41 Management [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Units in Real Estate Property | beds_or_units |  |  |  |  |  |  |  |  |  |  |  |  | 51 |  |  |
Number Of Additional Lease Renewal Options |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
Loans and Leases Receivable, Commitments, Fixed Rates |  |  |  |  |  |  | $ 10,800,000 |  |  |  |  |  |  |  |  |
Non-Performing Lease [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Income Statement, Lease Revenue |  |  |  |  |  |  | (625,000) |  |  |  |  |  |  |  |  |
Number of Lease Portfolios |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |
SH Regency Leasing LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties | properties |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |
Chancellor Health Care [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties | properties |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |
Operating Leases, Income Statement, Lease Revenue | $ (437,000) |  | $ (1,317,000) |  |  |  | (725,000) | $ (3,950,000) |  |  |  |  |  |  |  |
Percentage of Continuing Revenue |  |  | 2.00% |  |  |  |  | 3.00% |  |  |  |  |  |  |  |
Lease Payment, NOI Based, Percent |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |
SH Regency Transition Properties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Income Statement, Lease Revenue |  | $ (515,000) |  | $ (1,367,000) | $ (660,000) | $ (4,100,000) |  |  |  |  |  |  |  |  |  |
Percentage of Continuing Revenue |  |  |  | 2.00% |  | 3.00% |  |  |  |  |  |  |  |  |  |
Senior Housing Community [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties | properties |  |  |  |  |  |  |  |  |  | 145 |  |  |  |  |  |
Skilled Nursing Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties | properties |  |  |  |  |  |  |  |  |  | 72 |  |  |  |  |  |
Skilled Nursing Facility [Member] | National Healthcare Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties | properties |  |  |  |  |  |  |  |  |  | 39 |  |  |  |  |  |
Hospital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties | properties |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |
Medical Office Building [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties | properties |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Assisted Living Facility [Member] | Discovery Senior Living [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Units in Real Estate Property | beds_or_units |  |  |  |  |  |  |  |  |  |  |  |  | 356 |  |  |
Independent Living Facility [Member] | Discovery Senior Living [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Units in Real Estate Property | beds_or_units |  |  |  |  |  |  |  |  |  |  |  |  | 145 |  |  |
Independent Living Facility [Member] | National Healthcare Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties | properties |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |
Memory Care [Member] | Discovery Senior Living [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Units in Real Estate Property | beds_or_units |  |  |  |  |  |  |  |  |  |  |  |  | 95 |  |  |
Joint Venture Controlling Equity Interest [Member] | Discovery Senior Living [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investments During The Period |  |  |  |  |  |  | 127,286,000 |  |  |  |  |  |  |  |  |
Joint Venture Preferred Equity Interest [Member] | Discovery Senior Living [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investments During The Period |  |  |  |  |  |  | 102,258,000 |  |  |  |  |  |  |  |  |
Joint Venture Noncontrolling Equity Interest [Member] | Discovery Senior Living [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investments During The Period |  |  |  |  |  |  | 631,000 |  |  |  |  |  |  |  |  |
Joint Venture Equity Interest [Member] | Discovery Senior Living [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investments During The Period |  |  |  |  |  |  | 25,028,000 |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  |  |  |  |  |  | 97.50% |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |
Bickford Lease Amendment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties | properties |  |  |  |  |  |  |  |  |  | 14 |  |  |  |  |  |
Bickford Lease Amendment [Member] | Bickford Senior Living [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Escalator Minimum |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |
Lease Escalator Maximum |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |
MN Transition Properties [Member] | Bickford Senior Living [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Income Statement, Lease Revenue |  |  |  |  |  |  | $ (734,000) |  |  |  |  |  |  |  |  |
MN Transition Properties [Member] | 41 Management [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lessor, Operating Lease, Term of Contract | 15 years |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |
Number Of Additional Lease Renewal Options | renewalOptions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Lease Renewal Period In Years | 5 years |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Lease Escalator Minimum |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |
Operating Leases, Income Statement, Lease Revenue |  |  |  |  |  |  | $ (906,000) |  |  |  |  |  |  |  |  |
Discovery Transition Property [Member] | Discovery Senior Living [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Additional Lease Renewal Options | renewalOptions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Lease Renewal Period In Years | 5 years |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Lease Escalator Minimum |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |
Loans and Leases Receivable, Commitments, Fixed Rates |  |  |  |  |  |  | $ 750,000 |  |  |  |  |  |  |  |  |
Note Receivable Interest Rate |  |  |  |  |  |  |  |  |  |  | 6.50% |  |  |  |  |
Operating Leases, Income Statement, Lease Revenue |  |  |  |  |  |  | (1,400,000) |  |  |  |  |  |  |  |  |
Contingent Payment [Member] | Comfort Care Senior Living [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incentive to Lessee |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 |  |
Vero Beach Acquisition [Member] | Assisted Living Facility [Member] | Holiday Acquisition Holdings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Units in Real Estate Property | beds_or_units |  |  |  |  |  |  |  |  |  |  |  |  | 71 |  |  |
Vero Beach Acquisition [Member] | Independent Living Facility [Member] | Holiday Acquisition Holdings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Units in Real Estate Property | beds_or_units |  |  |  |  |  |  |  |  |  |  |  |  | 157 |  |  |
Right of First Offer [Member] | Wingate Healthcare [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties | properties |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Holiday Lease Amendment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Amendment Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  | 55,125,000 |  |
Escrow Deposit |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,275,000 |  |
Holiday Lease Amendment [Member] | Holiday Acquisition Holdings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum Annual Lease Income |  |  |  |  |  |  | 31,500,000 |  |  |  |  |  |  |  |  |
Prior to Lease Amendment [Member] | Holiday Acquisition Holdings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum Annual Lease Income |  |  |  |  |  |  | 39,000,000 |  |  |  |  |  |  |  |  |
Asset Held For Sale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties | properties |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Write Off Of Straight Line Rent Receivable |  |  |  |  |  |  | 124,000 |  |  |  |  |  |  |  |  |
Asset Held For Sale [Member] | Brookdale Senior Living [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties | properties |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  |
Operating Leases, Income Statement, Lease Revenue | $ (1,062,000) |  |  |  |  |  | $ (3,187,000) |  |  |  |  |  |  |  |  |
Percentage of Continuing Revenue | (1.30%) |  |  |  |  |  | (1.40%) |  |  |  |  |  |  |  |  |
Gurnee, IL [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction, Transaction Costs, Investing Activities |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |
Gurnee, IL [Member] | Bickford Senior Living [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties | properties |  |  |  |  |  |  |  |  |  | 60 |  |  |  |  |  |
Payments to Acquire Real Estate |  |  |  |  |  |  | 15,100,000 |  |  |  |  |  |  |  |  |
Notes Reduction |  |  |  |  |  |  | 14,035,000 |  |  |  |  |  |  |  |  |
Payments to Acquire Assets, Investing Activities |  |  |  |  |  |  | $ 965,000 |  |  |  |  |  |  |  |  |
Lessor, Operating Lease, Term of Contract | 12 years |  |  |  |  |  | 12 years |  |  |  |  |  |  |  |  |
Initial lease rate |  |  |  |  |  |  |  |  |  |  | 8.00% |  |  |  |  |
ARIZONA | Asset Held For Sale [Member] | Brookdale Senior Living [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties | properties |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |
TENNESSEE | Asset Held For Sale [Member] | Brookdale Senior Living [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties | properties |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |
SOUTH CAROLINA | Asset Held For Sale [Member] | Brookdale Senior Living [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties | properties |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Building and Building Improvements [Member] | Discovery Senior Living [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investments During The Period |  |  |  |  |  |  | $ 121,616,000 |  |  |  |  |  |  |  |  |
Forfeiture Amount [Member] | Holiday Lease Amendment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Escrow Deposit |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,637,000 |  |
Cash Portion [Member] | Holiday Lease Amendment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Amendment Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,125,000 |  |
Subleased Facilities [Member] | Skilled Nursing Facility [Member] | National Healthcare Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties | properties |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |
NHC - 1991 Lease [Member] | National Healthcare Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties | properties |  |  |  |  |  |  |  |  |  | 35 |  |  |  |  |  |
Number Of Additional Lease Renewal Options | renewalOptions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Lease Renewal Period In Years | 5 years |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Minimum Annual Lease Income |  |  |  |  |  |  | $ 30,750,000 |  |  |  |  |  |  |  |  |
Percentage Rent Rate |  |  |  |  |  |  | 0.04 |  |  |  |  |  |  |  |  |
May 2019 [Member] | Comfort Care Senior Living [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Real Estate Properties Acquired | properties |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Real Estate Investments During The Period |  |  |  |  |  |  | $ 13,500,000 |  |  |  |  |  |  |  |  |
May 2019 [Member] | Assisted Living Facility [Member] | Comfort Care Senior Living [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Units in Real Estate Property | beds_or_units |  |  |  |  |  |  |  |  |  |  |  |  | 73 |  |  |
Land [Member] | Discovery Senior Living [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investments During The Period |  |  |  |  |  |  | $ 6,301,000 |  |  |  |  |  |  |  |  |
April 2019 [Member] | Comfort Care Senior Living [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Real Estate Properties Acquired | properties |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Real Estate Investments During The Period |  |  |  |  |  |  | $ 10,800,000 |  |  |  |  |  |  |  |  |
Number of Units in Real Estate Property | beds_or_units |  |  |  |  |  |  |  |  |  |  |  |  | 60 |  |  |
Payments to Acquire Real Estate |  |  |  |  |  |  | $ 9,282,000 |  |  |  |  |  |  |  |  |
April 2019 [Member] | Asset under Construction [Member] | Comfort Care Senior Living [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Units in Real Estate Property | beds_or_units |  |  |  |  |  |  |  |  |  |  |  |  | 14 |  |  |
NHC - 2013 Lease [Member] | National Healthcare Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Real Estate Properties Acquired | properties |  |  |  |  |  |  | 7 |  |  |  |  |  |  |  |  |
Minimum Annual Lease Income |  |  |  |  |  |  | $ 3,450,000 |  |  |  |  |  |  |  |  |
Percentage Rent Rate |  |  |  |  |  |  | 0.04 |  |  |  |  |  |  |  |  |
Purchase Option Amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 49,000,000 |  |

X
- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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- Definition Asset Purchase Transaction Costs + References No definition available. + Details
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Namespace Prefix: | nhi_
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Balance Type: | debit
Period Type: | duration

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- Definition This element represents the total amount of capital improvements that an entity has committed to complete. + References No definition available. + Details
Name: | nhi_CapitalImprovementsCommitment
Namespace Prefix: | nhi_
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Balance Type: | debit
Period Type: | instant

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- Definition This item represents contingent payments that would be due to a development manager if certain operating metrics or performance thresholds were met. + References No definition available. + Details
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Namespace Prefix: | nhi_
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- Definition The initial rate charged under a lease entered into in connection with the purchase of a property. + References No definition available. + Details
Name: | nhi_InitialLeaseRate
Namespace Prefix: | nhi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition This item represents consideration received in exchange for granting an amendment to a lease agreement. + References No definition available. + Details
Name: | nhi_LeaseAmendmentConsideration
Namespace Prefix: | nhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition This item represents the maximum amount a lease will escalate each year. + References No definition available. + Details
Name: | nhi_LeaseEscalatorMaximum
Namespace Prefix: | nhi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition This item represents the minimum rate a lease payment escalates each year. + References No definition available. + Details
Name: | nhi_LeaseEscalatorMinimum
Namespace Prefix: | nhi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The initial lease escalator to be charged starting after lease year 4 under a lease entered into in connection with the purchase of a property. + References No definition available. + Details
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Namespace Prefix: | nhi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition This item relates to the percent of facility NOI to be paid as lease payment. + References No definition available. + Details
Name: | nhi_LeasePaymentNOIBasedPercent
Namespace Prefix: | nhi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition This item represents the number of shares of a lessor that are owned by a significant lessee as of the end of the reporting period. + References No definition available. + Details
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Namespace Prefix: | nhi_
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- Definition This item represents the amount of loan and realty impairments net of any applicable gains or recoveries. + References No definition available. + Details
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Namespace Prefix: | nhi_
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Balance Type: | debit
Period Type: | duration

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- Definition This element represents the minimum annual lease income to be received. + References No definition available. + Details
Name: | nhi_MinimumAnnualLeaseIncome
Namespace Prefix: | nhi_
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Balance Type: | credit
Period Type: | duration

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- Definition This item represents the original cost of corporate assets that are not part of the investment portfolio. + References No definition available. + Details
Name: | nhi_NonportfolioAssetsOriginalCost
Namespace Prefix: | nhi_
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Balance Type: | debit
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- Definition This concept reflects the interest rate to be received on a loan receivable. + References No definition available. + Details
Name: | nhi_NoteReceivableInterestRate
Namespace Prefix: | nhi_
Data Type: | num:percentItemType
Balance Type: | na
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- Definition Number Of Additional Lease Renewal Options + References No definition available. + Details
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Namespace Prefix: | nhi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of lessees of real estate property at the end of the period. + References No definition available. + Details
Name: | nhi_NumberOfLessees
Namespace Prefix: | nhi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number Of Real Estate Properties Acquired + References No definition available. + Details
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Namespace Prefix: | nhi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition This item relates to the number of lease portfolios which is group of properties leased through one or more leases to the same operator or to related operators. + References No definition available. + Details
Name: | nhi_NumberofLeasePortfolios
Namespace Prefix: | nhi_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of Master Leases + References No definition available. + Details
Name: | nhi_NumberofMasterLeases
Namespace Prefix: | nhi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition This element represents the percentage of income recognized from a lease tenant. + References No definition available. + Details
Name: | nhi_PercentageOfContinuingRevenue
Namespace Prefix: | nhi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the rental revenue rate earned during the period from lessee-operators based on revenues generated in their operations, generally in excess of a base amount. Generally stipulated in the lease agreement, it 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. + References No definition available. + Details
Name: | nhi_PercentageRentRate
Namespace Prefix: | nhi_
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Balance Type: | na
Period Type: | duration

X
- Definition This item represents the amount of an outstanding purchase option. + References No definition available. + Details
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Namespace Prefix: | nhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The element represents the original cost of all portfolio leased assets. + References No definition available. + Details
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Namespace Prefix: | nhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Real Estate Investments During The Period + References No definition available. + Details
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Namespace Prefix: | nhi_
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Balance Type: | debit
Period Type: | duration

X
- Definition This item represents an accumulated straight-line rent receivable balance written off as a result of a lease amendment or termination. + References No definition available. + Details
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Namespace Prefix: | nhi_
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Balance Type: | debit
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X
- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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X
- Definition This item represents the deferred charge for an incentive or inducement granted by a lessor to a lessee, in order to motivate the lessee to enter the lease agreement, which incentive or inducement is to be recognized as a reduction of rental revenue over the lease term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e40019-112707 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e40010-112707 + Details
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Period Type: | instant

X
- Definition Term of lessor's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919359-209981 + Details
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Balance Type: | na
Period Type: | instant

X
- Definition Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919359-209981 + Details
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Balance Type: | na
Period Type: | instant

X
- Definition Reflects the amount of cash required to fully fund agreements to provide advances to borrowers and lessees at stated interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=108315417&loc=d3e61044-112788 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108315417&loc=d3e61082-112788 + Details
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Period Type: | duration

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- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The value of notes retired (or transferred to another entity) in noncash investing or financing transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 + Details
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X
- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | instant

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- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
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X
- Definition The number of units in a real estate property owned as of the balance sheet date. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition 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://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707 + Details
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X
- Definition Aggregate cash payments for a combination of transactions that are classified as investing activities in which assets, which may include securities, other types of investments, or productive assets, are purchased from third-party sellers. This element can be used by entities to aggregate payments for all asset purchases that are classified as investing activities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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Period Type: | duration

X
- Definition The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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Balance Type: | credit
Period Type: | duration

X
- Definition Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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Balance Type: | debit
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- Definition Amount of cash outflow for transaction costs in a sale-leaseback recognized in investing activities. Includes, but is not limited to, closing and debt issuance costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=82846721&loc=d3e51843-112757 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=82846721&loc=d3e51840-112757 Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=82846721&loc=d3e51831-112757 + Details
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