Fair Value Disclosures (Narrative) (Details) (USD $)	0 Months Ended	12 Months Ended
Mar. 03, 2011	Dec. 31, 2014	Dec. 31, 2013	Apr. 03, 2014
Estimated market rate used for determining discounted cash flow for fixed rate notes	5.29%
Mortgage notes and related accrued interest receivable, net		$ 507,955,000	$ 486,337,000
Investment in a direct financing lease, net		199,332,000	242,212,000	45,900,000
Finance lease investment weighted average interest rate		11.99%	12.01%
Minimum interest on investments in direct finance lease		11.74%
Maximum interest on investments in direct finance lease			12.38%
Debt		1,645,523,000us-gaap_LongTermDebt	1,475,336,000us-gaap_LongTermDebt
Fixed Rate Mortgage Notes Receivable [Member]
Mortgage notes and related accrued interest receivable, net		508,000,000	486,300,000
Weighted average interest rate of mortgage notes receivable		9.07%	9.05%
Receivable interest rate minimum		5.50%	5.50%
Receivable interest rate maximum		11.31%	11.31%
Weighted market rate used for determining future cash flow for notes receivable		10.13%	10.12%
Fair value of notes receivable		488,800,000	465,200,000
Variable Rate Debt [Member]
Debt		372,000,000	290,000,000
Long-term debt, weighted average interest rate		1.57%	1.62%
Variable Rate Converted to Fixed Rate [Member]
Debt		240,000,000	240,000,000
Fixed Rate Debt [Member]
Long-term Debt, Fair Value		1,380,000,000	1,240,000,000
Debt		$ 1,270,000,000	$ 1,190,000,000
Long-term debt, weighted average interest rate		5.94%	6.10%
Weighted market rate for determining fair value of debt		3.76%	4.85%
Minimum [Member] \| Fixed Rate Mortgage Notes Receivable [Member]
market rate used as discount factor to determine fair value of notes		9.00%	9.00%
Minimum [Member] \| Fixed Rate Debt [Member]
market rate used as discount factor to determine fair value of debt		2.13%	2.63%
Maximum [Member] \| Fixed Rate Mortgage Notes Receivable [Member]
market rate used as discount factor to determine fair value of notes		11.31%	11.31%
Maximum [Member] \| Fixed Rate Debt [Member]
market rate used as discount factor to determine fair value of debt		4.56%	5.56%

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

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- Definition

Finance lease investment Weighted Average Interest Rate

+ References

No definition available.

+ Details

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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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+ Details

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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

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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

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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

+ References

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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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- 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

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. 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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20, 22

-Article 5

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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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.

+ Details

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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

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 4

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25496975&loc=d3e45377-112738

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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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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Subparagraph b

-Article 5

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