Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2196772

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- Definition

Number of Loans Held-for-sale

+ References

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- Definition

Number of Loans Receivable Held-for-sale, Sold

+ References

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Fair Value Measures - Fair value, by balance sheet grouping (Details) $ in Thousands		12 Months Ended
	Jan. 15, 2019 mortgage_note	Dec. 31, 2018 USD ($) mortgage_note	Dec. 31, 2017 USD ($)
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total liabilities		$ 6,130,685	$ 6,121,676
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total liabilities		6,130,329	6,263,898
Level 1 [Member] \| Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets		10,164
Level 1 [Member] \| Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets		10,164
Level 2 [Member] \| Mortgage Notes Payable and other debt, net [Member] \| Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total liabilities		1,933,209	2,095,690
Level 2 [Member] \| Mortgage Notes Payable and other debt, net [Member] \| Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total liabilities		1,961,496	2,144,522
Level 2 [Member] \| Corporate Bonds, Net [Member] \| Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total liabilities		3,395,885	2,848,768
Level 2 [Member] \| Corporate Bonds, Net [Member] \| Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total liabilities		3,368,928	2,922,027
Level 2 [Member] \| Convertible Debt, Net [Member] \| Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total liabilities		398,591	992,218
Level 2 [Member] \| Convertible Debt, Net [Member] \| Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total liabilities		396,905	1,012,349
Level 2 [Member] \| Credit Facility [Member] \| Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total liabilities		403,000	185,000
Level 2 [Member] \| Credit Facility [Member] \| Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total liabilities		$ 403,000	185,000
Level 3 [Member] \| Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets			20,294
Level 3 [Member] \| Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets			$ 28,272
Mortgage notes receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of notes receivable held for sale \| mortgage_note		3
Number of mortgage notes receivable \| mortgage_note		5
Subsequent Event [Member] \| Mortgage notes receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of notes receivable held for sale \| mortgage_note	4
Number of mortgage notes receivable \| mortgage_note	1