Fair Value Disclosures (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	May 21, 2015
Impairment charges	$ 10,195	$ 0	$ 0
Mortgage Notes and Related Accrued Interest Receivable, Net	970,749	613,978
Investment in direct financing leases, net	$ 57,903	$ 102,698		$ 4,700
Finance lease investment weighted average interest rate	11.98%	12.00%
Minimum interest on investments in direct finance lease	11.90%	11.79%
Maximum interest on investments in direct finance lease	12.38%	12.38%
Debt	$ 3,028,827	$ 2,485,625
Fixed Rate Mortgage Notes Receivable [Member]
Mortgage Notes and Related Accrued Interest Receivable, Net	$ 970,700	$ 614,000
Weighted average interest rate of mortgage notes receivable	8.42%	8.77%
Receivable interest rate minimum	7.00%	7.00%
Receivable interest rate maximum	11.31%	11.31%
Fair value of notes receivable	$ 992,600	$ 648,500
Weighted market rate used for determining future cash flow for notes receivable	8.79%	8.48%
Variable Rate Debt [Member]
Debt	$ 635,000	$ 375,000
Long-term debt, weighted average interest rate	2.58%	3.23%
Variable Rate Converted to Fixed Rate [Member]
Debt	$ 350,000	$ 300,000
Fixed Rate Debt [Member]
Long-term Debt, Fair Value	2,530,000	2,210,000
Debt	$ 2,430,000	$ 2,140,000
Long-term debt, weighted average interest rate	5.15%	5.27%
Weighted market rate for determining fair value of debt	4.04%	4.26%
Minimum [Member] \| Fixed Rate Mortgage Notes Receivable [Member]
market rate used as discount factor to determine fair value of notes	7.00%	7.00%
Minimum [Member] \| Fixed Rate Debt [Member]
market rate used as discount factor to determine fair value of debt	2.49%	2.97%
Maximum [Member] \| Fixed Rate Mortgage Notes Receivable [Member]
market rate used as discount factor to determine fair value of notes	11.50%	12.00%
Maximum [Member] \| Fixed Rate Debt [Member]
market rate used as discount factor to determine fair value of debt	4.56%	4.75%

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

No definition available.

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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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- Definition

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

+ References

No definition available.

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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

+ References

No definition available.

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- Definition

Receivable interest rate stated percentage rate range maximum

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Receivable interest rate stated percentage rate range minimum.

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- Definition

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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- Definition

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 of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228

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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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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.

+ References

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
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-Paragraph 4
-Subparagraph (a)
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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