Fair Value Disclosures (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2019	Dec. 31, 2018	Jul. 26, 2018
Mortgage notes and related accrued interest receivable	$ 550,131	$ 517,467
Investment in direct financing leases, net	$ 20,675	$ 20,558	$ 37,900
Finance lease investment weighted average interest rate	12.04%	12.04%
Minimum interest on investments in direct finance lease	11.93%	11.93%
Maximum interest on investments in direct finance lease	12.38%	12.38%
Debt	$ 3,216,623	$ 2,986,054
Fixed Rate Mortgage Notes Receivable [Member]
Mortgage notes and related accrued interest receivable	$ 550,100	$ 517,500
Weighted average interest rate of mortgage notes receivable	8.68%	8.67%
Receivable interest rate minimum	7.00%	7.00%
Receivable interest rate maximum	11.61%	11.43%
Weighted market rate used for determining future cash flow for notes receivable	8.63%	8.68%
Fair value of notes receivable	$ 581,500	$ 544,600
Variable Rate Debt [Member]
Debt	$ 683,600	$ 455,000
Long-term debt, weighted average interest rate	3.25%	2.84%
Variable Rate Converted to Fixed Rate [Member]
Debt	$ 400,000	$ 350,000
Fixed Rate Debt [Member]
Debt	$ 2,570,000	$ 2,570,000
Long-term debt, weighted average interest rate	4.86%	4.86%
Weighted market rate for determining fair value of debt	3.76%	4.69%
Long-term Debt, Fair Value	$ 2,700,000	$ 2,570,000
Minimum [Member] \| Fixed Rate Mortgage Notes Receivable [Member]
market rate used as discount factor to determine fair value of notes	7.50%	7.50%
Minimum [Member] \| Fixed Rate Debt [Member]
market rate used as discount factor to determine fair value of debt	3.14%	3.48%
Maximum [Member] \| Fixed Rate Mortgage Notes Receivable [Member]
market rate used as discount factor to determine fair value of notes	10.00%	10.00%
Maximum [Member] \| Fixed Rate Debt [Member]
market rate used as discount factor to determine fair value of debt	4.56%	4.99%
Imagine Schools Member
Investment in direct financing leases, net	$ 20,700	$ 20,600

Finance lease investment Weighted Average Interest Rate

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- Definition

When presenting a range of interest rates, the highest rate for investment in direct finance lease as of the balance sheet date.

+ References

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- Definition

When presenting a range of interest rates, the lowest rate for investment in direct finance lease as of the balance sheet date.

+ References

No definition available.

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- Definition

market rate used as discount factor to determine fair value of debt

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market rate used as discount factor to determine fair value of notes

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- Definition

The balance represents the amount of loans, including accrued interest receivable, that are secured by real estate mortgages, offset by the allowance for loan losses.

+ References

No definition available.

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- Definition

Mortgage receivable weighted average interest rate

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No definition available.

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Receivable interest rate stated percentage rate range maximum

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Receivable interest rate stated percentage rate range minimum.

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Weighted Average Market Rate Used As Discount Factor To Determine Fair Value Of Debt

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No definition available.

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Weighted Average Market Rate Used As Discount Factor To Determine Fair Value Of Notes

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No definition available.

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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- Definition

Weighted average interest rate of long-term debt outstanding calculated at point in time.

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No definition available.

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- Definition

The net amount due as of the balance sheet date consisting of: (a) minimum lease payments due on direct financing and sales-type leases, (b) unguaranteed residual value, and (c) any unamortized initial direct costs on direct financing leases; less: (i) executory costs, (ii) unearned income, and (iii) the accumulated allowance for uncollectible minimum lease payments.

+ References

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-Section 50
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- Definition

Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date.

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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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